aircraft production programmes such as the Airbus A380 with an
estimated number of aircraft to be produced using such tools, the
sum-of-the-units method effectively allocates the diminution of
value of specialised tools to the units produced. Property, plant
and equipment is derecognised when it has been disposed of or
when the asset is permanently withdrawn from use. The difference
between the net disposal proceeds and the carrying amount of
such assets is recognised in the Consolidated Income Statement
in the period of derecognition.