(1) Section 56 of the Finance Act, 1988, is hereby amended in subsection (3) -
(a) by the insertion in paragraph (b) of ", has a research octane number of 95.4 or less" after "paragraph (a)", and
(b) by the insertion of the following paragraph after paragraph (b):
"(c) In paragraph (b) ‘research octane number’ means the research octane number measured in accordance with the American Society for Testing and Materials method D2699-94 or other equivalent method.".
(2) This section shall come into operation on such day as the Minister for Finance may appoint by order.