(1) In this section -
'relevant trading charges on income' and 'relevant trading income' have the same meanings, respectively, as in section 243A;
'relevant trading loss', in relation to an accounting period of a company, means a loss incurred in the accounting period in a trade carried on by the company, other than -
(a) so much of the loss as is a loss incurred in an excepted trade within the meaning of section 21A, and
(b) [deleted]
(2) Notwithstanding subsections (1) and (6) of section 420 and section 421, where in any accounting period the surrendering company incurs a relevant trading loss or an excess of relevant trading charges on income, that loss or excess may not be set off for the purposes of corporation tax against the total profits of the claimant company for its corresponding accounting period.
(a) Where in any accounting period the surrendering company incurs a relevant trading loss, computed as for the purposes of section 396(2), or an excess of relevant trading ch
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