49U.K.In section 49 of the Gains Act (contingent liabilities) for subsection (2) (adjustment to be made if it is shown to the satisfaction of the inspector that a contingent liability has become enforceable) there shall be substituted—
“(2)If any such contingent liability subsequently becomes enforceable and is being or has been enforced, there shall be made, on a claim being made to that effect, such adjustment, whether by way of discharge or repayment of tax or otherwise, as is required in consequence.”