OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Finance Act 1984 : chapter 43 : ss.63-71, 92-100, 128(1)-(3)(6), schs. 13, 14, 19, 20, 23, Pt.VIII. ISBN 0118046284. Published by H.M.S.O. in 1984. Publication and catalogue information, links to buy online and reader comments.