Non-financial assets that have an indefinite useful life and intangible assets that are not ready to use are not subject to depreciation or amortisation but are tested annually for impairment. Non-financial assets that are subject to depreciation or amortisation are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognised for the amount by which the asset’s carrying amount exceeds its recoverable amount. The recoverable amount is the higher of an asset’s fair value less costs of disposal and value in use. For the purposes of assessing impairment, assets are grouped at the lowest levels for which there are largely independent cash inflows (CGUs). Prior impairments of non-financial assets (other than goodwill) are reviewed for possible reversal at each reporting date.