(1) Subject to this Chapter, where -
(a) a person carries on in an accounting period the trade of farming in respect of which the person is within the charge to tax under Case I of Schedule D, and
(b) the value of the person's trading stock of that trade at the end of the accounting period (in this Chapter referred to as its "closing stock value") exceeds the value of the trading stock of that trade at the beginning of the accounting period (in this Chapter referred to as its "opening stock value"),
the person shall, in the computation for the purposes of tax of the trading income of that trade, be entitled to a deduction under this section equal to 25 per cent of the amount of that excess as if the deduction were a trading expense incurred in the accounting period, and the amount of that excess is referred to in this Chapter as the person's "increase in stock value".
(2) In the case of a company -
(a) the amount of the deduction under this section in an accounting period shall not exc
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