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Registered number: 07301752
STS ENGINE SERVICES LIMITED
(Formerly known as GT Engine Services Limited)
ANNUAL REPORT AND FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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STS ENGINE SERVICES LIMITED
COMPANY INFORMATION
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T A Clark (appointed 14 August 2025)
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D M Smith (appointed 31 October 2025)
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I Bartholomew (resigned 6 May 2025)
R Huff (resigned 31 October 2025)
G I Macleod (resigned 14 August 2025)
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Chartered Accountants & Statutory Auditor
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STS ENGINE SERVICES LIMITED
CONTENTS
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Independent Auditors' Report
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Statement of Comprehensive Income
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Statement of Changes in Equity
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Notes to the Financial Statements
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STS ENGINE SERVICES LIMITED
STRATEGIC REPORT
FOR THE YEAR ENDED 31 DECEMBER 2025
STS Engine Services Limited (formerly known as GT Engine Services Limited) is part of the US based, STS Aviation Group founded in 1984.
The STS Aviation Group consists of three global business segments:
1. Material Services: Focused on the sale of new and used materials to the aviation market through an extensive global distribution network including the manufacture, assembly and kitting of specialised aerospace components
2. Maintenance, Engineering & Modification Services: Focused on delivering flightline maintenance and engineering services in support of domestic and international airlines. We offer on-call, through-flight meet & greets, RON maintenance and AOG response teams. In addition, we specialise in major aircraft modification and reconfiguration services at our aircraft hangar that's supported by mobile, fleet modification teams deployed globally.
3. Staffing Services: Focuses on creating, customizing and executing end-to-end workforce management solutions, RPO (Recruitment Process Outsourcing) and MSP (Managed Service Provider) programs for businesses across the aviation / aerospace and defense industries, including in-house needs.
The Company maintained high service standards throughout the year, operating within a highly regulated environment and continuing to meet EASA and CAA requirements. Positive audit outcomes were achieved, supported by a continued focus on quality, compliance, and operational discipline. Key initiatives included targeted recruitment, investment in training and development, enhancements to quality assurance processes, and optimisation of workflow within the engine bay. These actions contributed to improved efficiency, reduced turnaround times, and enhanced customer satisfaction.
For the year ended 31 December 2025, the Company delivered a strong operational and financial performance, reflecting sustained demand for engine maintenance and repair services, alongside continued growth in engine storage and preservation activities at its Stansted facility. Following its acquisition by the Group in May 2024, the Company has continued to benefit from closer integration within the wider organisation, including access to shared infrastructure, cross-selling opportunities, and operational support.
Revenue increased by 11% compared to the prior year, driven by higher engine inductions and improved utilisation of the Company’s facilities. The Company also secured a number of significant contracts during the year, strengthening workload visibility. The Company continued to invest in its operational capability at Stansted, enhancing its ability to support a range of engine platforms and customer requirements, while maintaining a strong focus on safety, compliance, and continuous improvement.
Looking ahead, the outlook for the engine MRO market remains positive, supported by the continued recovery in global air traffic and increasing demand for life extension, storage, and reconfiguration of mature engine platforms. The Directors consider the Company to be well positioned to capitalise on these trends, supported by the Group’s global footprint and the Company’s established reputation for technical quality.
The Directors are satisfied with the Company’s performance in 2025 and remain confident in its ability to deliver sustainable growth. Further details on financial results, future developments, and the going concern assessment are set out in the Directors’ Report.
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STS ENGINE SERVICES LIMITED
STRATEGIC REPORT (CONTINUED)
FOR THE YEAR ENDED 31 DECEMBER 2025
Principal risks and uncertainties
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The Directors have assessed the key risks and uncertainties facing the Company. The following principal risks are considered most significant to the business:
• Supply Chain Vulnerabilities: The Company depends on the timely availability of critical engine parts and
materials from OEMs and approved vendors. Global supply chain disruptions, lead time volatility, and
parts scarcity continue to pose a risk to operational efficiency and turnaround times.
• Regulatory Compliance: As a provider of engine maintenance services within a highly regulated
aerospace environment, the Company is subject to rigorous oversight by aviation authorities including the
CAA and EASA. Any breach of airworthiness, safety, or documentation standards could lead to regulatory
sanctions, reputational damage, or the suspension of certifications required to operate.
• Foreign Exchange Exposure: A proportion of the Company’s costs and revenues are denominated in
foreign currencies, particularly USD and EUR. Movements in exchange rates may impact profitability
where natural hedging is not available or effective, particularly in relation to the purchase of imported
parts.
The Directors actively monitor these risks and continue to implement appropriate mitigation measures, including long-term customer engagement strategies, flexible scheduling of workshop capacity, multi-sourcing of parts where possible, robust internal compliance processes, and are exploring options to mitigate foreign exchange exposure.
Financial key performance indicators
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The Directors are satisfied with the results for the period. Sales revenues amounted to £16,872,913 (2024: £15,256,610) an increase of 11% against the prior year. Operating profit amounted to £1,883,804 (2024: £1,666,331).
No dividends were paid during the year (2024: £15,000). The directors do not recommend payment of a final dividend (2024: £Nil).
Other key performance indicators
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The Company is subject to various KPI’s and targets around service levels and delivery which are monitored closely and allow the Company to maintain the quality of its customer relationships.
This report was approved by the board and signed on its behalf.
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S D Morton
Director
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STS ENGINE SERVICES LIMITED
DIRECTORS' REPORT
FOR THE YEAR ENDED 31 DECEMBER 2025
The directors present their report and the financial statements for the year ended 31 December 2025.
Directors' responsibilities statement
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The directors are responsible for preparing the Strategic Report, the Directors' Report and the financial statements in accordance with applicable law and regulations.
Company law requires the directors to prepare financial statements for each financial year. Under that law the directors have elected to prepare the financial statements in accordance with applicable law and United Kingdom Accounting Standards (United Kingdom Generally Accepted Accounting Practice), including Financial Reporting Standard 102 ‘The Financial Reporting Standard applicable in the UK and Republic of Ireland'. Under company law the directors must not approve the financial statements unless they are satisfied that they give a true and fair view of the state of affairs of the Company and of the profit or loss of the Company for that period.
In preparing these financial statements, the directors are required to:
∙select suitable accounting policies for the Company's financial statements and then apply them consistently;
∙make judgments and accounting estimates that are reasonable and prudent;
∙state whether applicable UK Accounting Standards have been followed, subject to any material departures disclosed and explained in the financial statements; and
∙prepare the financial statements on the going concern basis unless it is inappropriate to presume that the Company will continue in business.
The directors are responsible for keeping adequate accounting records that are sufficient to show and explain the Company's transactions and disclose with reasonable accuracy at any time the financial position of the Company and to enable them to ensure that the financial statements comply with the Companies Act 2006. They are also responsible for safeguarding the assets of the Company and hence for taking reasonable steps for the prevention and detection of fraud and other irregularities.
The principal activity of the company is the provision of aircraft engine maintenance, repair and overhaul (MRO) services, including ancillary services such as engine conversion work, storage, and preservation.
The profit for the year, after taxation, amounted to £1,864,337 (2024 - £1,477,908).
No dividends were paid during the year (2024: £15,000). The directors do not recommend payment of a final dividend (2024: £Nil).
The directors who served during the year were:
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T A Clark (appointed 14 August 2025)
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D M Smith (appointed 31 October 2025)
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I Bartholomew (resigned 6 May 2025)
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R Huff (resigned 31 October 2025)
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G I Macleod (resigned 14 August 2025)
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STS ENGINE SERVICES LIMITED
DIRECTORS' REPORT (CONTINUED)
FOR THE YEAR ENDED 31 DECEMBER 2025
Principal risks and uncertainties
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Business Environment and Risk Considerations
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The Company’s principal risks and uncertainties are disclosed in the Strategic Report in accordance with Section 414C of the Companies Act 2006. The Directors refer users to that section for a detailed assessment of key operational, regulatory, and market-related risks.
UK businesses are currently facing many uncertainties such as the changes in US trade policy and the ongoing wars in Ukraine and the Middle East. These uncertainties have contributed to an environment where there exists a range of issues and risks, including inflation, rising interest rates, labour shortages, disrupted supply chains and new ways of working.
The Directors have carried out an assessment of the potential impact of these uncertainties on the business, including the impact of mitigation measures, and have concluded that these are non-adjusting events. The Directors have taken account of these potential impacts in their going concern assessment.
The Company continues to work with its partners to minimise any impacts of these events and maximise the realisation of any opportunities they may provide to the business.
Future Developments
The Company intends to build on its existing capabilities in aircraft engine maintenance and repair by continuing to invest in tooling, workforce training, and digital systems that enhance operational efficiency and regulatory compliance. Expansion of capacity to support next-generation engine platforms is also under review, in line with evolving customer requirements.
Engagement with employees
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The Directors support the participation of employees in the activities of the company, encourage employees to become involved in the pursuit of safety, efficiency and high performance, and provide employees with regular communication on the group's plans, performance and figures.
The company gives full consideration to applications for employment from disabled persons where the requirements of the job can be adequately fulfilled by a handicapped or disabled person.
Where existing employees become disabled, it is the company's policy wherever practicable to provide continuing employment under normal terms and conditions and to provide training and career development and promotion to disabled employees where appropriate.
Qualifying third party indemnity provisions
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The ultimate parent undertaking has arranged a third party indemnity policy for the directors.
Disclosure of information to auditors
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Each of the persons who are directors at the time when this Directors' Report is approved has confirmed that:
∙so far as the director is aware, there is no relevant audit information of which the Company's auditors are unaware, and
∙the director has taken all the steps that ought to have been taken as a director in order to be aware of any relevant audit information and to establish that the Company's auditors are aware of that information.
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STS ENGINE SERVICES LIMITED
DIRECTORS' REPORT (CONTINUED)
FOR THE YEAR ENDED 31 DECEMBER 2025
Post balance sheet events
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There have been no significant events affecting the Company since the year end.
The financial statements have been prepared on a going concern basis. The Board has prepared detailed cash flow forecasts for a period of twelve months post the signing of these financial statements, adjusting key assumptions and also incorporating significant contracts the company has secured.
The budgets have been sensitised for a range of material downside scenarios and stress tested to allow the Board to assess the impact of these scenarios on liquidity. The base case cash flow forecast projects that the business will continue as a going concern as a result of the significant contracts secured which provide sufficient cash headroom to allow the company to continue to meet its liabilities as they fall due.
The Board have concluded that, after due consideration, there is a reasonable expectation that the company has adequate resources to continue for the foreseeable future. For this reason, they continue to adopt the going concern basis in preparing these financial statements.
The auditors, Forvis Mazars LLP, will be proposed for reappointment in accordance with section 485 of the Companies Act 2006.
This report was approved by the board and signed on its behalf.
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S D Morton
Director
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STS ENGINE SERVICES LIMITED
INDEPENDENT AUDITORS' REPORT TO THE MEMBERS OF STS ENGINE SERVICES LIMITED
Opinion
We have audited the financial statements of STS Engine Services Limited (formerly known as GT Engine Services Limited) (the ‘Company’) for the year ended 31 December 2025 which comprise the Statement of Comprehensive Income, the Balance Sheet, the Statement of Changes in Equity and notes to the financial statements, including a summary of significant accounting policies.
The financial reporting framework that has been applied in their preparation is applicable law and United Kingdom Accounting Standards, including FRS 102 “The Financial Reporting Standard applicable in the UK and Republic of Ireland” (United Kingdom Generally Accepted Accounting Practice).
In our opinion, the financial statements:
∙give a true and fair view of the state of the Company’s affairs as at 31 December 2025 and of its profit for the year then ended;
∙have been properly prepared in accordance with United Kingdom Generally Accepted Accounting Practice; and
∙have been prepared in accordance with the requirements of the Companies Act 2006.
Basis for opinion
We conducted our audit in accordance with International Standards on Auditing (UK) (ISAs (UK)) and applicable law. Our responsibilities under those standards are further described in the Auditor’s responsibilities for the audit of the financial statements section of our report. We are independent of the Company in accordance with the ethical requirements that are relevant to our audit of the financial statements in the UK, including the FRC’s Ethical Standard and we have fulfilled our other ethical responsibilities in accordance with these requirements. We believe that the audit evidence we have obtained is sufficient and appropriate to provide a basis for our opinion.
Conclusions relating to going concern
In auditing the financial statements, we have concluded that the directors' use of the going concern basis of accounting in the preparation of the financial statements is appropriate.
Based on the work we have performed, we have not identified any material uncertainties relating to events or conditions that, individually or collectively, may cast significant doubt on the Company’s ability to continue as a going concern for a period of at least twelve months from when the financial statements are authorised for issue.
Our responsibilities and the responsibilities of the directors with respect to going concern are described in the relevant sections of this report.
Other information
The other information comprises the information included in the Annual Report and financial statements, other than the financial statements and our auditor’s report thereon. The directors are responsible for the other information contained within the Strategic Report and the Directors' report. Our opinion on the financial statements does not cover the other information and, except to the extent otherwise explicitly stated in our report, we do not express any form of assurance conclusion thereon.
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STS ENGINE SERVICES LIMITED
INDEPENDENT AUDITORS' REPORT TO THE MEMBERS OF STS ENGINE SERVICES LIMITED
Other information (continued)
Our responsibility is to read the other information and, in doing so, consider whether the other information is materially inconsistent with the financial statements or our knowledge obtained in the course of the audit, or otherwise appears to be materially misstated. If we identify such material inconsistencies or apparent material misstatements, we are required to determine whether this gives rise to a material misstatement in the financial statements themselves. If, based on the work we have performed, we conclude that there is a material misstatement of this other information, we are required to report that fact.
We have nothing to report in this regard.
Opinions on other matters prescribed by the Companies Act 2006
In our opinion, based on the work undertaken in the course of the audit:
∙the information given in the Strategic Report and the Directors' Report for the financial year for which the financial statements are prepared is consistent with the financial statements; and
∙the Strategic Report and the Directors' Report have been prepared in accordance with applicable legal requirements.
Matters on which we are required to report by exception
In light of the knowledge and understanding of the Company and its environment obtained in the course of the audit, we have not identified material misstatements in the Strategic Report or the Directors' Report.
We have nothing to report in respect of the following matters in relation to which the Companies Act 2006 requires us to report to you if, in our opinion:
∙adequate accounting records have not been kept, or returns adequate for our audit have not been received from branches not visited by us; or
∙the financial statements are not in agreement with the accounting records and returns; or
∙certain disclosures of directors' remuneration specified by law are not made; or
∙we have not received all the information and explanations we require for our audit.
Responsibilities of Directors
As explained more fully in the Directors' Responsibilities Statement set out on page 3, the directors are responsible for the preparation of the financial statements and for being satisfied that they give a true and fair view, and for such internal control as the directors determine is necessary to enable the preparation of financial statements that are free from material misstatement, whether due to fraud or error.
In preparing the financial statements, the directors are responsible for assessing the Company’s ability to continue as a going concern, disclosing, as applicable, matters related to going concern and using the going concern basis of accounting unless the directors intend either to liquidate the Company or to cease operations, or have no realistic alternative but to do so.
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STS ENGINE SERVICES LIMITED
INDEPENDENT AUDITORS' REPORT TO THE MEMBERS OF STS ENGINE SERVICES LIMITED
Auditor's responsibilities for the audit of the financial statements
Our objectives are to obtain reasonable assurance about whether the financial statements as a whole are free from material misstatement, whether due to fraud or error, and to issue an auditor’s report that includes our opinion. Reasonable assurance is a high level of assurance but is not a guarantee that an audit conducted in accordance with ISAs (UK) will always detect a material misstatement when it exists. Misstatements can arise from fraud or error and are considered material if, individually or in the aggregate, they could reasonably be expected to influence the economic decisions of users taken on the basis of these financial statements.
The extent to which our procedures are capable of detecting irregularities, including fraud is detailed below.
Irregularities, including fraud, are instances of non-compliance with laws and regulations. We design procedures in line with our responsibilities, outlined above, to detect material misstatements in respect of irregularities, including fraud.
Based on our understanding of the Company and its industry, we considered that non-compliance with the following laws and regulations might have a material effect on the financial statements: employment regulation, health and safety regulation and anti-money laundering regulation.
To help us identify instances of non-compliance with these laws and regulations, and in identifying and assessing the risks of material misstatement in respect to non-compliance, our procedures included, but were not limited to:
∙Inquiring of management and, where appropriate, those charged with governance, as to whether the company is in compliance with laws and regulations, and discussing their policies and procedures regarding compliance with laws and regulations;
∙Inspecting correspondence, if any, with relevant licensing or regulatory authorities;
∙Communicating identified laws and regulations to the engagement team and remaining alert to any indications of non-compliance throughout our audit; and
∙Considering the risk of acts by the company which were contrary to applicable laws and regulations, including fraud.
We also considered those laws and regulations that have a direct effect on the preparation of the financial statements, such as tax legislation, pension legislation, the Companies Act 2006.
In addition, we evaluated the directors' and management’s incentives and opportunities for fraudulent manipulation of the financial statements, including the risk of override of controls, and determined that the principal risks were related to posting manual journal entries to manipulate financial performance, management bias through judgements and assumptions in significant accounting estimates, in particular in relation to revenue recognition (which we pinpointed to the cut-off assertion), and significant one-off or unusual transactions.
Our audit procedures in relation to fraud included but were not limited to:
∙Making enquiries of the directors and management on whether they had knowledge of any actual, suspected or alleged fraud;
∙Gaining an understanding of the internal controls established to mitigate risks related to fraud;
∙Discussing amongst the engagement team the risks of fraud; and
∙Addressing the risks of fraud through management override of controls by performing journal entry testing.
There are inherent limitations in the audit procedures described above and the primary responsibility for the prevention and detection of irregularities including fraud rests with management. As with any audit, there remained a risk of non-detection of irregularities, as these may involve collusion, forgery, intentional omissions, misrepresentations or the override of internal controls.
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STS ENGINE SERVICES LIMITED
INDEPENDENT AUDITORS' REPORT TO THE MEMBERS OF STS ENGINE SERVICES LIMITED
Auditor's responsibilities for the audit of the financial statements (continued)
A further description of our responsibilities for the audit of the financial statements is located on the Financial Reporting Council’s website at www.frc.org.uk/auditorsresponsibilities. This description forms part of our auditor’s report.
Use of the audit report
This report is made solely to the Company's members as a body in accordance with Chapter 3 of Part 16 of the Companies Act 2006. Our audit work has been undertaken so that we might state to the Company's members those matters we are required to state to them in an auditor's report and for no other purpose. To the fullest extent permitted by law, we do not accept or assume responsibility to anyone other than the Company and the Company's members as a body for our audit work, for this report, or for the opinions we have formed.
Paul Kurowski (Senior statutory auditor)
for and on behalf of
Forvis Mazars LLP
Chartered Accountants and Statutory Auditor
Second Floor
Three Chamberlain Square
Birmingham
B3 3AX
22 May 2026
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STS ENGINE SERVICES LIMITED
STATEMENT OF COMPREHENSIVE INCOME
FOR THE YEAR ENDED 31 DECEMBER 2025
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Interest receivable and similar income
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Profit for the financial year
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There was no other comprehensive income for 2025 (2024: £Nil).
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The notes on pages 13 to 27 form part of these financial statements.
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STS ENGINE SERVICES LIMITED
REGISTERED NUMBER: 07301752
BALANCE SHEET
AS AT 31 DECEMBER 2025
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Debtors: amounts falling due within one year
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Creditors: amounts falling due within one year
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Total assets less current liabilities
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Creditors: amounts falling due after more than one year
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Provisions for liabilities
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The financial statements were approved and authorised for issue by the board and were signed on its behalf by:
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S D Morton
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The notes on pages 13 to 27 form part of these financial statements.
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STS ENGINE SERVICES LIMITED
STATEMENT OF CHANGES IN EQUITY
FOR THE YEAR ENDED 31 DECEMBER 2025
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Comprehensive income for the year
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Contributions by and distributions to owners
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Dividends: Equity capital
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Comprehensive income for the year
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The notes on pages 13 to 27 form part of these financial statements.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
The Company (registered number 07301752) is limited by shares and was incorporated in England and Wales. The registered office and trading address is Hangar 5 Airport Cargo, Birmingham Airport, Birmingham, England, B26 3QN.
The principal activity of the company is the provision of aircraft engine maintenance, repair and overhaul (MRO) services, including ancillary services such as engine conversion work, storage, and preservation.
The Company changed its name from GT Engine Services Limited to STS Engine Services Limited on 28 October 2025.
The significant accounting policies applied in the preparation of these financial statements are set out below. These policies have been consistently applied to all years presented unless otherwise stated.
2.Accounting policies
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Basis of preparation of financial statements
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The financial statements have been prepared under the historical cost convention unless otherwise specified within these accounting policies and in accordance with Financial Reporting Standard 102, the Financial Reporting Standard applicable in the UK and the Republic of Ireland and the Companies Act 2006.
The preparation of financial statements in compliance with FRS 102 requires the use of certain critical accounting estimates. It also requires management to exercise judgment in applying the Company's accounting policies (see note 3).
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Financial Reporting Standard 102 - reduced disclosure exemptions
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The Company has taken advantage of the following disclosure exemptions in preparing these financial statements, as permitted by the FRS 102 "The Financial Reporting Standard applicable in the UK and Republic of Ireland":
∙the requirements of Section 7 Statement of Cash Flows;
∙the requirements of Section 3 Financial Statement Presentation paragraph 3.17(d);
∙the requirements of Section 11 Financial Instruments paragraphs 11.42, 11.44 to 11.45, 11.47, 11.48(a)(iii), 11.48(a)(iv), 11.48(b) and 11.48(c);
∙the requirements of Section 12 Other Financial Instruments paragraphs 12.26 to 12.27, 12.29(a), 12.29(b) and 12.29A.
This information is included in the consolidated financial statements of STS Aviation Europe Limited as at 31 December 2025 and these financial statements may be obtained from Companies House.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
2.Accounting policies (continued)
The financial statements have been prepared on a going concern basis. The Board has prepared detailed cash flow forecasts for a period of twelve-months post the signing of these financial statements, adjusting key assumptions and also incorporating significant contracts the company has secured.
The budgets have been sensitised for a range of material downside scenarios and stress tested to allow the Board to assess the impact of these scenarios on liquidity. The base case cash flow forecast projects that the business will continue as a going concern as a result of the significant contracts secured which provide sufficient cash headroom to allow the company to continue to meet its liabilities as they fall due.
The Board have concluded that, after due consideration, there is a reasonable expectation that the company has adequate resources to continue for the foreseeable future. For this reason, they continue to adopt the going concern basis in preparing these financial statements.
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Foreign currency translation
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Functional and presentation currency
The Company's functional and presentational currency is GBP. Monetary amounts in these financial statements are rounded to the nearest £.
Transactions and balances
Foreign currency transactions are translated into the functional currency using the spot exchange rates at the dates of the transactions.
At each period end foreign currency monetary items are translated using the closing rate. Non-monetary items measured at historical cost are translated using the exchange rate at the date of the transaction and non-monetary items measured at fair value are measured using the exchange rate when fair value was determined.
Foreign exchange gains and losses resulting from the settlement of transactions and from the translation at period-end exchange rates of monetary assets and liabilities denominated in foreign currencies are recognised in the Statement of Comprehensive Income except when deferred in other comprehensive income as qualifying cash flow hedges.
Foreign exchange gains and losses that relate to borrowings and cash and cash equivalents are presented in the Statement of Comprehensive Income within 'finance income or costs'. All other foreign exchange gains and losses are presented in the Statement of Comprehensive Income within 'administrative expenses'.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
2.Accounting policies (continued)
Revenue is recognised to the extent that it is probable that the economic benefits will flow to the Company and the revenue can be reliably measured. Revenue is measured as the fair value of the consideration received or receivable, excluding discounts, rebates, value added tax and other sales taxes. The following criteria must also be met before revenue is recognised:
Rendering of services
Revenue from a contract to provide services is recognised in the period in which the services are provided in accordance with the stage of completion of the contract when all of the following conditions are satisfied:
∙the amount of revenue can be measured reliably;
∙it is probable that the Company will receive the consideration due under the contract;
∙the stage of completion of the contract at the end of the reporting period can be measured reliably; and
∙the costs incurred and the costs to complete the contract can be measured reliably.
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Operating leases: the Company as lessee
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Rentals paid under operating leases are charged to the Statement of Comprehensive Income on a straight-line basis over the lease term.
Benefits received and receivable as an incentive to sign an operating lease are recognised on a straight-line basis over the lease term, unless another systematic basis is representative of the time pattern of the lessee's benefit from the use of the leased asset.
Interest income is recognised in the Statement of Comprehensive Income using the effective interest method.
Finance costs are charged to the Statement of Comprehensive Income over the term of the debt using the effective interest method so that the amount charged is at a constant rate on the carrying amount. Issue costs are initially recognised as a reduction in the proceeds of the associated capital instrument.
Defined contribution pension plan
The Company operates a defined contribution plan for its employees. A defined contribution plan is a pension plan under which the Company pays fixed contributions into a separate entity. Once the contributions have been paid the Company has no further payment obligations.
The contributions are recognised as an expense in the Statement of Comprehensive Income when they fall due. Amounts not paid are shown in accruals as a liability in the Balance Sheet. The assets of the plan are held separately from the Company in independently administered funds.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
2.Accounting policies (continued)
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Current and deferred taxation
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The tax expense for the year comprises current and deferred tax. Tax is recognised in the Statement of Comprehensive Income except that a charge attributable to an item of income and expense recognised as other comprehensive income or to an item recognised directly in equity is also recognised in other comprehensive income or directly in equity respectively.
The current income tax charge is calculated on the basis of tax rates and laws that have been enacted or substantively enacted by the balance sheet date in the countries where the Company operates and generates income.
Deferred tax balances are recognised in respect of all timing differences that have originated but not reversed by the balance sheet date, except that:
∙The recognition of deferred tax assets is limited to the extent that it is probable that they will be recovered against the reversal of deferred tax liabilities or other future taxable profits; and
∙Any deferred tax balances are reversed if and when all conditions for retaining associated tax allowances have been met.
Deferred tax balances are not recognised in respect of permanent differences except in respect of business combinations, when deferred tax is recognised on the differences between the fair values of assets acquired and the future tax deductions available for them and the differences between the fair values of liabilities acquired and the amount that will be assessed for tax. Deferred tax is determined using tax rates and laws that have been enacted or substantively enacted by the balance sheet date.
Tangible fixed assets under the cost model are stated at historical cost less accumulated depreciation and any accumulated impairment losses. Historical cost includes expenditure that is directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management.
Depreciation is charged so as to allocate the cost of assets less their residual value over their estimated useful lives, using the straight-line method.
Depreciation is provided on the following basis:
The assets' residual values, useful lives and depreciation methods are reviewed, and adjusted prospectively if appropriate, or if there is an indication of a significant change since the last reporting date.
Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are recognised in the Statement of Comprehensive Income.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
2.Accounting policies (continued)
Stocks are stated at the lower of cost and net realisable value, being the estimated selling price less costs to complete and sell. Cost is based on the cost of purchase on a weighted average basis. Work in progress and finished goods include labour and attributable overheads.
At each balance sheet date, stocks are assessed for impairment. If stock is impaired, the carrying amount is reduced to its selling price less costs to complete and sell. The impairment loss is recognised immediately in the Statement of Comprehensive Income.
Short-term debtors are measured at transaction price, less any impairment.
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Cash and cash equivalents
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Cash is represented by cash in hand and deposits with financial institutions repayable without penalty on notice of not more than 24 hours. Cash equivalents are highly liquid investments that mature in no more than three months from the date of acquisition and that are readily convertible to known amounts of cash with insignificant risk of change in value.
Short-term creditors are measured at the transaction price. Other financial liabilities are measured initially at fair value, net of transaction costs, and are measured subsequently at amortised cost using the effective interest method.
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Provisions for liabilities
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Provisions are recognised when an event has taken place that gives rise to a legal or constructive obligation, a transfer of economic benefits is probable and a reliable estimate can be made.
Provisions are measured as the best estimate of the amount required to settle the obligation, taking into account the related risks and uncertainties.
Increases in provisions are generally charged as an expense to the Statement of Comprehensive Income.
The Company has elected to apply the provisions of Section 11 “Basic Financial Instruments” of FRS 102 to all of its financial instruments.
Financial instruments are recognised in the Company's Balance Sheet when the Company becomes party to the contractual provisions of the instrument.
Financial assets and liabilities are offset, with the net amounts presented in the financial statements, when there is a legally enforceable right to set off the recognised amounts and there is an intention to settle on a net basis or to realise the asset and settle the liability simultaneously.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
2.Accounting policies (continued)
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Financial instruments (continued)
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Basic financial assets
Basic financial assets, which include trade and other debtors, cash and bank balances, are initially measured at their transaction price (adjusted for transaction costs except in the initial measurement of financial assets that are subsequently measured at fair value through profit and loss) and are subsequently carried at their amortised cost using the effective interest method, less any provision for impairment, unless the arrangement constitutes a financing transaction, where the transaction is measured at the present value of the future receipts discounted at a market rate of interest.
Discounting is omitted where the effect of discounting is immaterial. The Company's cash and cash equivalents, trade and most other debtors due with the operating cycle fall into this category of financial instruments.
Other financial assets
Other financial assets, which includes investments in equity instruments which are not classified as subsidiaries, associates or joint ventures, are initially measured at fair value, which is normally the recognised transaction price. Such assets are subsequently measured at fair value with the changes in fair value being recognised in the profit or loss. Where other financial assets are not publicly traded, hence their fair value cannot be measured reliably, they are measured at cost less impairment.
Impairment of financial assets
Financial assets are assessed for indicators of impairment at each reporting date.
Financial assets are impaired when events, subsequent to their initial recognition, indicate the estimated future cash flows derived from the financial asset(s) have been adversely impacted. The impairment loss will be the difference between the current carrying amount and the present value of the future cash flows at the asset(s) original effective interest rate.
If there is a favourable change in relation to the events surrounding the impairment loss then the impairment can be reviewed for possible reversal. The reversal will not cause the current carrying amount to exceed the original carrying amount had the impairment not been recognised. The impairment reversal is recognised in the profit or loss.
Basic financial liabilities
Financial liabilities and equity instruments are classified according to the substance of the contractual arrangements entered into. An equity instrument is any contract that evidences a residual interest in the assets of the Company after the deduction of all its liabilities.
Basic financial liabilities, which include trade and other creditors, are initially measured at their transaction price (adjusting for transaction costs except in the initial measurement of financial liabilities that are subsequently measured at fair value through profit and loss). When this constitutes a financing transaction, whereby the debt instrument is measured at the present value of the future payments discounted at a market rate of interest, discounting is omitted where the effect of discounting is immaterial.
Debt instruments are subsequently carried at their amortised cost using the effective interest rate method.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
2.Accounting policies (continued)
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Financial instruments (continued)
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Trade creditors are obligations to pay for goods and services that have been acquired in the ordinary course of business from suppliers. Trade creditors are classified as current liabilities if the payment is due within one year. If not, they represent non-current liabilities. Trade creditors are initially recognised at their transaction price and subsequently are measured at amortised cost using the effective interest method. Discounting is omitted where the effect of discounting is immaterial.
Equity dividends are recognised when they become legally payable. Interim equity dividends are recognised when paid. Final equity dividends are recognised when approved by the shareholders at an annual general meeting.
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Judgments in applying accounting policies and key sources of estimation uncertainty
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Preparation of the financial statements in conformity with generally accepted accounting policies requires the directors to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results in the future could differ from those estimates. In this regard, the directors believe that the critical accounting policies where judgments or estimates are necessarily applied are summarised below:
Tangible fixed assets
Tangible fixed assets are depreciated over their useful lives. The actual lives of the assets are assessed annually and may vary depending on a number of factors. In re-assessing asset lives, factors such as technological innovation, product life cycles and maintenance programmes are taken into account.
The whole of turnover is attributable to the principal activity of the Company.
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All turnover arose within the United Kingdom.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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The operating profit is stated after charging:
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Depreciation on assets under hire purchase agreement
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Depreciation of owned tangible fixed assets
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Other operating lease rentals
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During the year, the Company obtained the following services from the Company's auditors:
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Fees payable to the Company's auditors for the audit of the Company's financial statements
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The Company has taken advantage of the exemption not to disclose amounts paid for non-audit services as these are disclosed in the consolidated accounts of the parent Company.
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Staff costs, including directors' remuneration, were as follows:
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Cost of defined contribution scheme
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The average monthly number of employees, including the directors, during the year was as follows:
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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Company contributions to defined contribution pension schemes
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During the year retirement benefits were accruing to 2 directors (2024: 1) in respect of defined contribution pension schemes.
Directors' remuneration is now borne by other group companies following the acquisition of the Company by STS Aviation Europe Limited in the prior period.
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Other interest receivable
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Current tax on profits for the year
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Adjustments in respect of previous periods
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Origination and reversal of timing differences
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
11.Taxation (continued)
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Factors affecting tax charge for the year
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The tax assessed for the year is lower than (2024 - lower than) the standard rate of corporation tax in the UK of25% (2024 -25%). The differences are explained below:
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Profit on ordinary activities before tax
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Profit on ordinary activities multiplied by standard rate of corporation tax in the UK of 25% (2024 - 25%)
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Expenses not deductible for tax purposes, other than goodwill amortisation and impairment
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Capital allowances for year in excess of depreciation
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Adjustments to tax charge in respect of prior periods
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Income not taxable for tax purposes
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Total tax charge for the year
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Factors that may affect future tax charges
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There were no factors that may affect future tax charges.
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Dividends of £Nil (2024: £15) per share declared and paid
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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The depreciation charge for the year has been included in administrative expenses.
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The net book value of assets held under finance leases or hire purchase contracts, included above, are as follows:
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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Finished goods and goods for resale
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Amounts owed by group undertakings
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Amounts owed by group undertakings are unsecured, interest-free and are repayable on demand.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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Creditors: Amounts falling due within one year
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Amounts owed to group undertakings
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Other taxation and social security
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Obligations under finance lease and hire purchase contracts
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Accruals and deferred income
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Amounts owed to group undertakings are unsecured, interest-free and are repayable on demand.
Net obligations under finance leases and hire purchase contracts of £16,629 (2024: £19,621) are secured over the assets concerned.
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Creditors: Amounts falling due after more than one year
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Net obligations under finance leases and hire purchase contracts
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Net obligations under finance leases and hire purchase contracts of £Nil (2024: £14,465) are secured over the assets concerned.
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Hire purchase and finance leases
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Minimum lease payments under hire purchase fall due as follows:
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
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Charged to the Statement of Comprehensive Income
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The provision for deferred taxation is made up as follows:
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Accelerated capital allowances
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Short term timing differences
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Allotted, called up and fully paid
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1,000 (2024: 1,000) Ordinary shares of £1.00 each
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There is a single class of ordinary shares. There are no restrictions on dividends and the repayment of capital.
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Profit and loss account
The profit and loss account includes all current and prior period profits and losses.
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Contingent liabilities - fixed and floating charges
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At 31 December 2025 there is an unlimited guarantee between the company and STS Aviation Europe Limited, STS Aviation Services UK Limited, GTES Holdings Limited, Apple Aviation Global Limited and MEM Business, LLC in respect of a loan with Blue Owl Capital Corporation.
The instrument creates a fixed charge over material intellectual property and a fixed charge over material real property. The floating charge covers all the property or undertaking of the Company.
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STS ENGINE SERVICES LIMITED
NOTES TO THE FINANCIAL STATEMENTS
FOR THE YEAR ENDED 31 DECEMBER 2025
The Company operates a defined contributions pension scheme. The assets of the scheme are held separately from those of the Company in an independently administered fund. The pension cost charge represents contributions payable by the Company to the fund and amounted to £141,381 (2024: £110,297). Contributions totalling £29,000 (2024: £20,284) were payable to the fund at the reporting date and are included in creditors.
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Commitments under operating leases
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At 31 December 2025 the Company had future minimum lease payments due under non-cancellable operating leases for each of the following periods:
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Later than 1 year and not later than 5 years
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Related party transactions
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The Company has taken advantage of exemption, under the terms of Financial Reporting Standard 102 'The Financial Reporting Standard applicable in the UK and Republic of Ireland', not to disclose related party transactions with fellow group undertakings.
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GTES Holdings Limited is the Company's immediate parent undertaking, a company incorporated in England and Wales.
The smallest group in which the company's results are consolidated in to is headed up by STS Aviation Europe Limited, a company registered in England and Wales. STS Aviation Europe Limited prepares consolidated financial statements which includes this company and are available from Companies House.
The ultimate parent undertaking is STS Aggregator L.P which does not prepare consolidated accounts. The largest undertaking for which group accounts are prepared is STS Parent LLC, a limited liability company registered in the US.
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