143(1)This paragraph applies if—U.K.
(a)a relevant period of account begins before 1 April 2009 and ends on or after that date, and
(b)in order to arrive at the profits or losses of an accounting period ending before 1 April 2009 it is necessary to apportion the profits or losses of the relevant period of account to any part of that period before 1 April 2009.
(2)A period of account is a “relevant period” if—
(a)section 1307 applies to the period of account, and
(b)the profits or losses of the part of the period of account falling in an accounting period ending after 31 March 2009 are calculated in accordance with this Act.
(3)The profits or losses of the relevant period of account—
(a)are calculated in accordance with this Act (and therefore, to that extent, this Act has effect for accounting periods ending before 1 April 2009), and
(b)may be apportioned in accordance with section 1307 to any part of the period of account falling in an accounting period ending before 1 April 2009.