Basis of preparation The abridged financial statements have been prepared on the historical cost basis, as modified by the revaluation of certain financial assets and liabilities and investment properties measured at fair value through profit or loss. The abridged financial statements are prepared in sterling, which is the functional currency of the entity. Stocks 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 stock to its present location and condition. Impairment of fixed assets A review for indicators of impairment is carried out at each reporting date, with the recoverable amount being estimated where such indicators exist. Where the carrying value exceeds the recoverable amount, the asset is impaired accordingly. Prior impairments are also reviewed for possible reversal at each reporting date. For the purposes of impairment testing, when it is not possible to estimate the recoverable amount of an individual asset, an estimate is made of the recoverable amount of the cash-generating unit to which the asset belongs. The cash-generating unit is the smallest identifiable group of assets that includes the asset and generates cash inflows that largely independent of the cash inflows from other assets or groups of assets. For impairment testing of goodwill, the goodwill acquired in a business combination is, from the acquisition date, allocated to each of the cash-generating units that are expected to benefit from the synergies of the combination, irrespective of whether other assets or liabilities of the company are assigned to those units. Finance leases and hire purchase contracts Assets held under finance leases and hire purchase contracts are recognised in the abridged statement of financial position as assets and liabilities at the lower of the fair value of the assets and the present value of the minimum lease payments, which is determined at the inception of the lease term. Any initial direct costs of the lease are added to the amount recognised as an asset. Lease payments are apportioned between the finance charges and reduction of the outstanding lease liability using the effective interest method. Finance charges are allocated to each period so as to produce a constant rate of interest on the remaining balance of the liability.