Intangible fixed assets (including purchased goodwill and patents) are included at cost less accumulated amortisation. 

Tangible fixed assets are measured at cost less accumulated depreciation and any accumulated impairment losses. Depreciation is provided at rates calculated to write off the cost of the fixed assets, less their estimated residual value, over their expected useful lives on the following bases:

Assets held under finance leases which are leases where substantially all the risks and rewards of ownership of the asset have passed to the company, and hire purchase contracts are capitalised in the balance sheet. They are depreciated over the shorter of their useful lives or the term of the lease. 

Stock is valued at the lower of cost and estimated selling price less costs to complete and sell. The cost methodology employed by the entity is the first-in first-out method. Estimated selling price less costs to complete and sell are derived from the selling price which the goods would fetch in an open market transaction with established customers less the costs expected to be incurred to enable the sale to complete. Provision is made for slow-moving and obsolete items of stock. Such provisions are recognised in profit or loss. Work in progress is valued using the percentage of completion method and values are calculated using the lower of cost and estimated selling price less costs to complete and sell. When stocks are sold, the carrying amount of those stocks is recognised as an expense within cost of sales. This takes place in the same period that the associated revenue is recognised.

Transactions in foreign currencies are initially recognised at the rate of exchange ruling at the date of the transaction. At the end of each reporting period foreign currency monetary items are translated at the closing rate of exchange. Non-monetary items that are measured at historical cost are translated at the rate ruling at the date of the transaction. All differences are charged to profit or loss.