8In section 31 (writing-down allowances) the following subsection shall be substituted for subsection (6)—
“(6)For any chargeable period of the single ship trade for which the amount of a writing-down allowance is reduced by virtue of a requirement in a claim made by virtue of section 24(3), any reference in subsections (3) to (5) above to the writing-down allowance is a reference to the reduced amount of the allowance, as specified in the claim.”