Assets held for purposes of mines, transport undertakings, etc
33Credits and debits to be brought into account in any accounting period in respect of an asset held by the company for the purposes of a concern listed in section 55(2) of the Taxes Act 1988 (mines, transport undertakings, etc) that is carried on by the company in that period are given effect by treating—
(a)credits as receipts of the concern, and
(b)debits as expenses of the concern,
in computing the profits of the concern under Case I of Schedule D.