823. Part disposal: apportionment of allowable expenditure.

Where a person disposes of an interest in, or a right in or over, an asset, and generally wherever on the disposal of an asset any description of property derived from that asset remains undisposed of, there is an apportionment of the expenditure attributable to that asset for the purpose of computing the gain on the part disposal and of applying Part II of the Taxation of Chargeable Gains Act 1992 to the part undisposed of