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2U.K.A company's pool of field allowances for an accounting period (“the relevant accounting period”) is—
where—
P is the amount of the company's pool of field allowances for the previous accounting period that has been carried into the relevant accounting period (see paragraphs 3 and 4), and
R is the aggregate of the amounts of field allowances for new oil fields which the company holds (see Part 3) that are activated in respect of—
(a) the relevant accounting period (see Part 4), and
(b) reference periods that fall within the relevant accounting period (see Part 5).