(1) For the purposes of this section -
(a) a trade carried on by 2 or more persons shall be treated as belonging to them in the shares in which they are entitled to the profits of the trade;
(b) a trade or interest in a trade belonging to any person as trustee (otherwise than for charitable or public purposes) shall be treated as belonging to the persons for the time being entitled to the income under the trust;
(c) a trade or interest in a trade belonging to a company shall, where the result of so doing is that subsection (5) or (10) applies in relation to an event, be treated in any of the ways permitted by subsection (2).
(2) For the purposes of this section, a trade or interest in a trade which belongs to a company engaged in carrying on the trade may be regarded -
(a) as belonging to the persons owning the ordinary share capital of the company and as belonging to those persons in proportion to the amount of their holdings of that capital, or
(b) in the case of a company which is a
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