(a) In this section, "trading stock" means, subject to paragraph (b), property of any description, whether real or personal, which is either -
(i) property such as is sold in the ordinary course of the trade in relation to which the expression is used or would be so sold if it were mature or if its manufacture, preparation or construction were complete, or
(ii) materials such as are used in the manufacture, preparation or construction of property such as is sold in the ordinary course of that trade.
(b) For the purposes of this section -
(i) 'trading stock', in relation to a trade, includes any services, article or material which, if the trade were a profession, would be treated as work in progress of the profession for the purposes of section 90, and references to the sale or transfer of trading stock shall be construed accordingly;
(ii) two persons are connected with each other if -
(I) they are connected with each other within the meaning of section 10;
(II) one of them is a par
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