7(1)For the purposes of paragraph 6(1)(a) above, a “business establishment”, in relation to a controlled foreign company, means premises—U.K.
(a)which are, or are intended to be, occupied and used with a reasonable degree of permanence; and
(b)from which the company’s business in the territory in which it is resident is wholly or mainly carried on.
(2)For the purposes of sub-paragraph (1) above the following shall be regarded as premises—
(a)an office, shop, factory or other building or part of a building; or
(b)a mine, an oil or gas well, a quarry or any other place of extraction of natural resources; or
(c)a building site or the site of a construction or installation project;
but such a site as is referred to in paragraph (c) above shall not be regarded as premises unless the building work or the project, as the case may be, has a duration of at least twelve months.