Paragraph 8(2) of Schedule 11 to the M1Electricity Act 1989 (treatment of certain debentures for the purposes of the Corporation Tax Acts) shall have effect, and be deemed always to have had effect, with the addition after paragraph (b) of the words—

“ and if any such debenture includes provision for the payment of a sum expressed as interest in respect of a period which falls wholly or partly before the issue of the debenture, any payment made in pursuance of that provision in respect of that period shall be treated for the purposes of the Corporation Tax Acts as if the debenture had been issued at the commencement of that period and, accordingly, as interest on the principal sum payable under the debenture. ”