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(a) in relation to any expenditure incurred prior to the 6th day of April, 1965, the total amount of any allowances made in respect of that expenditure under section 244 (3) increased by the amount of any allowance made under section 244 (4) (b) or, as the case may be, reduced by any amount treated as a trading receipt pursuant to section 244 (4) (c), and
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(b) in relation to any expenditure incurred on or after the 6th day of April, 1965, the amount of any allowance made in respect of that expenditure under section 244 (3) reduced by any amount treated as a trading receipt pursuant to section 244 (4) (c) as it applies to expenditure incurred on or after that date;
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