Section 21 of the Finance Act, 1989, is hereby amended, as respects interest paid on or before the 31st day of December, 1991, by the substitution of the following paragraph for paragraph (b) of subsection (2):
"(b) the interest or other distribution is paid on or before the 31st day of December, 1991, in respect of -
(i) a period before that date, and
(ii) a security issued before the 12th day of April, 1989.".