Stocks are valued at the lower of cost and net realisable value. Cost is the historic price of acquiring each property. Net realisable value is based on an estimated selling price, less further costs to be incurred to completion and disposal.
The cost of finished goods and work in progress comprises direct materials and, where applicable, direct labour cost and those overheads that have been incurred in bringing the inventories to their present location and condition. At each reporting date, stocks are assessed for impairment. If stocks are impaired, the carrying amount is reduce to its selling price less costs to complete and sell; the impairment loss is recognised immediately in profit or loss.