Borrowing costsBorrowing costs relating to the acquisition of assets are capitalised at the appropriate rate by adding them to the cost of assets being acquired. Investment income earned on the temporary investment of specific borrowings pending their expenditure on the assets is deducted from the borrowing costs eligible for capitalisation. All other borrowing costs are recognised in profit or loss in the period in which they are incurred.Trade and other debtorsTrade and other payables are initially recognised at fair value and thereafter stated at amortised cost using the effective interest rate method, unless the effect of discounting would be immaterial, in which case they are stated at cost.Taxation and deferred taxationCurrent tax represents the amount expected to be paid or recovered in respect of taxable profits for the year and is calculated using the tax rates and laws that have been enacted or substantially enacted at the Statement of Financial Position date.Deferred tax is recognised in respect of all timing differences that have originated but not reversed at the balance sheet date where transactions or events have occurred at that date that will result in an obligation to pay more tax in the future, or a right to pay less tax in the future. Timing differences are temporary differences between the company's taxable profits and its results as stated in the financial statements.Deferred tax is measured on an undiscounted basis at the tax rates that are anticipated to apply in the periods in which the timing differences are expected to reverse, based on tax rates and laws that have been enacted or substantively enacted by the balance sheet date.Foreign currenciesMonetary assets and liabilities denominated in foreign currencies are translated at the rates of exchange ruling at the Statement of Financial Position date. Non-monetary items that are measured in terms of historical cost in a foreign currency are translated at the rates of exchange ruling at the date of the transaction. Non-monetary items that are measured at fair value in a foreign currency are translated using the exchange rates at the date when the fair value was determined. The resulting exchange differences are dealt with in the Income Statement.