The have been prepared on the historical cost basis, as modified by the revaluation of certain assets.

The are prepared in sterling, which is the functional currency of the company.

Current tax is recognised on taxable profit for the current and past periods. Current tax is measured at the amounts of tax expected to pay or recover using the tax rates and laws that have been enacted or substantively enacted at the reporting date.

Purchased goodwill arises on business acquisitions and represents the difference between the cost of acquisition and the fair values of the identifiable assets and liabilities acquired.

Goodwill is initially recorded at cost, and is subsequently stated at cost less any accumulated amortisation and accumulated impairment losses. It is amortised on a straight-line basis over the useful economic life of the asset. Where a reliable estimate of the useful life of goodwill cannot be made, the life is presumed not to exceed five years.

Tangible assets are initially measured at cost, and are subsequently measured at cost less any accumulated depreciation and accumulated impairment losses or at a revalued amount.

Stocks are measured at the lower of cost and estimated selling price less costs to complete and sell. Cost includes all costs of purchase, costs of conversion and other costs incurred in bringing the stocks to their present location and condition.

Contributions to defined contribution plans are recognised as an expense in the period in which the related service is provided. Prepaid contributions are recognised as an asset to the extent that the prepayment will lead to a reduction in future payments or a cash refund.