4(1)This paragraph has effect as respects relief under any enactment repealed by the principal Act, or repealed or terminated by any Act passed before that Act, so far as it remains in force after the commencement of this Act.
(2)Section 42 of this Act shall apply to any such relief in like manner as section 9 of the [1964 c. 37.] Income Tax Management Act 1964 would have applied but for the passing of this Act, and nothing in the repeals made by the principal Act shall affect any enactment determining whether the claim is made to the inspector or the Board, or the Commissioners to whom an appeal lies on the claim.