23(1)This paragraph applies if—U.K.
(a)a sum is payable, but not paid, by the company carrying on a trade to the Export Credits Guarantee Department under an agreement mentioned in section 91(a) or with a view to entering into such an agreement,
(b)the sum was incurred in a period of account no part of which falls in an accounting period ending after 31 March 2009, and
(c)the sum has not been taken into account in calculating the profits of the trade of any accounting period.
(2)A deduction is allowed for the sum in calculating the profits of the period of account in which it is paid.