(a) In this section -
'corporation tax referable to dealing in residential development land', in relation to an accounting period of a company, means the corporation tax referable to trading income from dealing in residential development land within the meaning of subsection (2) of section 644B as reduced under that section;
'relevant corporation tax', in relation to an accounting period of a company, means the corporation tax which would be chargeable on the company for the accounting period apart from -
(i) this section and sections 239, 241, 420B, 440 and 441, and
(ii) where the company carries on a life business (within the meaning of section 706), any corporation tax which would be attributable to policyholders' profits;
'relevant trading income' has the same meaning as it has in section 243A;
'residential development land' has the same meaning as it has in section 644A(1).
(b) Where an accounting period of a company begins before 31 December 2008 and ends after that day, it s
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