Impairment of non-financial assets

The group assesses tangible and intangible assets, excluding goodwill, development assets not yet available for use and indefinite life intangible assets, at each reporting date for an indication that an asset may be impaired. If such an indication exists, the recoverable amount is estimated as the higher of the fair value less cost of disposal and the value in use. If the carrying value exceeds the recoverable amount, the asset is impaired and is written down to the recoverable amount. Where it is not possible to estimate the recoverable amount of an individual asset, the recoverable amount of the cash-generating unit to which the asset belongs is estimated.

For assets excluding goodwill, an assessment is made at each reporting date as to whether there is any indication that previously recognised impairment losses may no longer exist or may have decreased. If such an indication exists, the group estimates the asset's or cash-generating unit's recoverable amount.