Intangible assets acquired separately are measured initially at cost. The cost of intangible assets acquired in abusiness combination is their fair values as at the date of acquisition. Following initial acquisition, intangible assetsare measured at cost less any accumulated amortisation and accumulated impairment losses. Internally generatedintangible assets, excluding capitalised development assets are not capitalised and expenditure is reflected in theincome statement in the period in which the expenditure is incurred.The useful lives of intangible assets are assessed as either finite or indefinite.Intangible assets with finite useful lives are amortised over their estimated useful lives and assessed forimpairment whenever there is an indication that the intangible asset may be impaired. The amortisation period andthe amortisation method are reviewed at least once at each financial year end. Changes in the expected useful lifeor the expected pattern of consumption of future economic benefits embodied in the asset is accounted for bychanging the amortisation period or method, as appropriate, and are treated as changes in accounting estimates.The amortisation expense on intangible assets with finite lives is recognised in the income statement in theexpense category consistent with the function of the intangible asset.Intangible assets with indefinite useful lives or not yet available for use are tested for impairment annually or morefrequently if events and circumstances indicate that the carrying value may be impaired either individually or atthe cash-generating unit level. Such intangible assets are not amortised. The useful life of an intangible asset withan indefinite useful life is reviewed annually to determine whether the useful life assessment continues to besupportable, if not the change in useful lives from indefinite to finite is made on a prospective basis.Gains or losses arising from thederecognition of an intangible asset are measured as the difference between thenet disposal proceeds and the carrying amount of the asset and are recognised in the income statement when theasset is derecognised.