| 2.7 | Property, plant and equipment |
Property, plant and equipment is stated at historical cost less depreciation and impairment losses. Historical cost includes expenditure that is directly attributable to the acquisition of the items.
Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, as appropriate, only when it is probable that future economic benefits associated with the item will flow to the Group and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. All other repairs and maintenance are charged to the income statement during the financial period in which they are incurred.
Depreciation on property, plant and equipment is calculated using the straight-line method to allocate their cost to their residual values over their estimated useful lives, as follows:
| Buildings |
12-40 years | |||
| Plant and machinery |
12-20 years | |||
| Vehicles and other equipment |
4-20 years |
The assets’ residual values and useful lives are reviewed, and adjusted if appropriate, at the end of each reporting period.
An asset’s carrying amount is written down immediately to its recoverable amount if the asset’s carrying amount is greater than its estimated recoverable amount (Note 2.11).
Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are recognized within “Other gains/(losses) – net” in the income statement.