(1)If because of any of sections 803 to 815 an asset is excluded to the extent that—
(a)it represents particular rights,
(b)it is an asset of a particular description,
(c)it is held for particular purposes, or
(d)it represents expenditure of a particular kind,
this Part applies as if there were a separate asset representing so much of the asset as is not so excluded.
(2)The other provisions of the Corporation Tax Acts apply as if there were a separate asset representing so much of the asset as is excluded.
(3)Any apportionment necessary for the purposes of this section must be made on a just and reasonable basis.