Sch 15 para 63
The purchaser is required, as a condition of the approval of the election— (a) to comply with the profit tracking requirements in relation to— (i) the accounting period in which the interest in a UK oil licence, referred to in paragraph 1, is acquired by the purchaser, and (ii) each subsequent accounting period; and (b) to keep and preserve records, in accordance with such requirements as may be specified by an officer of Revenue and Customs, for the purposes of giving effect to this Schedule.