(1) In this section -
"prior 3 years", in relation to a loss incurred in a year of assessment, means the last 3 years of assessment before that year;
"prior period of loss" means the prior 3 years or, if losses were incurred in successive years of assessment amounting in the aggregate to a period longer than 3 years (and ending when the prior 3 years end), that longer period.
(a) Any loss (including any amount in respect of allowances which by virtue of section 392 is to be treated as a loss) incurred in a trade of farming or market gardening shall not be available for relief under section 381 unless it is shown that, for the year of assessment in which the loss is claimed to have been incurred, the trade was being carried on on a commercial basis and with a view to the realisation of profits in the trade.
(b) Without prejudice to paragraph (a), any loss (including any amount in respect of allowances which by virtue of section 392 is to be treated as a loss) incurred in any year of
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