The government's UK copyright law site outlines the IPO and Copyright, Designs and Patents Act 1988, the principal legislation covering intellectual property rights in the United Kingdom and the work to which it applies.
For what it's worth, there's a program on BBC R4 at the moment (1:30pm 12th April) about
Music Libraries, more about the music itself rather than a 'how to' but still may be
useful to some?