Financial instruments A financial asset or a financial liability is recognised only when the entity becomes a party to the contractual provisions of the instrument. Basic financial instruments are initially recognised at the transaction price and are subsequently measured as follows: Debt instruments are subsequently measured at amortised cost and commitments to receive a loan and to make a loan to another entity are subsequently measured at amortised cost. Where investments in non-convertible preference shares and non-puttable ordinary shares or preference shares are publicly traded or their fair value can otherwise be measured reliably, the investment is subsequently measured at fair value with changes in fair value recognised in profit or loss. All other such investments are subsequently measured at cost less impairment. All other financial instruments, including derivatives, are initially recognised at fair value, which is normally the transaction price and are subsequently measured at fair value, with any changes recognised in profit or loss. Financial assets that are measured at cost or amortised cost are reviewed for objective evidence of impairment at the end of each reporting date. If there is objective evidence of impairment, an impairment loss is recognised in profit or loss immediately. All equity instruments regardless of significance, and other financial assets that are individually significant, are assessed individually for impairment. Other financial assets are either assessed individually or grouped on the basis of similar credit risk characteristics. Any reversals of impairment are recognised in profit or loss immediately, to the extent that the reversal does not result in a carrying amount of the financial asset that exceeds what the carrying amount would have been had the impairment not previously been recognised. Taxation Taxation for the year comprises current and deferred tax. Tax is recognised in the Income Statement, except to the extent that it relates to items recognised in other comprehensive income or directly in equity. Current or deferred taxation assets and liabilities are not discounted. Current tax is recognised at the amount of tax payable using the tax rates and laws that have been enacted or substantively enacted by the balance sheet date. Deferred tax Deferred tax is recognised in respect of all timing differences that have originated but not reversed at the balance sheet date. Timing differences arise from the inclusion of income and expenses in tax assessments in periods different from those in which they are recognised in financial statements. Deferred tax is measured using tax rates and laws that have been enacted or substantively enacted by the year end and that are expected to apply to the reversal of the timing difference. Unrelieved tax losses and other deferred tax assets are recognised only to the extent that it is probable that they will be recovered against the reversal of deferred tax liabilities or other future taxable profits. Provision for liabilities Provisions are recognised when the entity has an obligation at the reporting date as a result of a past event; it is probable that the entity will be required to transfer economic benefits in settlement and the amount of the obligation can be estimated reliably. Provisions are recognised as a liability in the statement of financial position and the amount of the provision as an expense. Provisions are initially measured at the best estimate of the amount required to settle the obligation at the reporting date and subsequently reviewed at each reporting date and adjusted to reflect the current best estimate of the amount that would be required to settle the obligation. Any adjustments to the amounts previously recognised are recognised in profit or loss unless the provision was originally recognised as part of the cost of an asset. When a provision is measured at the present value of the amount expected to be required to settle the obligation, the unwinding of the discount is recognised in finance costs in profit or loss in the period it arises.