d. Property, plant and equipment
Property, plant and equipment are stated at historical cost less depreciation. Cost includes the original purchase price of the asset and the costs attributable to bringing the asset to its working condition for intended use. Land is not depreciated. Depreciation on other assets is calculated using the straight-line method to allocate their cost less their residual values over their estimated useful lives as follows:
|
Buildings (freehold): |
20-50 years | |
|
Buildings (leasehold): |
over the period of the lease | |
|
Plant and equipment: |
3-10 years |
The assets’ residual values and useful lives are reviewed, and adjusted if appropriate, at each balance sheet date.
The carrying value of an asset is written down to its recoverable amount if the carrying value of the asset is greater than its estimated recoverable amount.