485Qualifying expenditure
(1)Expenditure on dredging is qualifying expenditure if—
(a)it is capital expenditure,
(b)it is incurred for the purposes of a qualifying trade by the person carrying on the trade, and
(c)if the person does not carry on a qualifying trade within section 484(2)(a), the dredging is for the benefit of vessels coming to, leaving or using a dock or other premises occupied by the person for the purposes of the qualifying trade.
(2)If capital expenditure is incurred—
(a)partly for the purposes of a qualifying trade, and
(b)partly for other purposes,
the qualifying expenditure is the part of the capital expenditure that, on a just and reasonable apportionment, is referable to the purposes of the qualifying trade.
(3)If part only of a trade or undertaking is within section 484(2), subsection (2) of this section applies as if—
(a)the part which is within section 484(2), and
(b)the part which is not,
were separate trades.