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.
Just give them a bell and discuss your requirements - they are very friendly & will send
you any appropriate info or forms - thier website is quite good as well.
You have economic and moral rights to
your copyrights. You can, if you want, set out detailed conditions for how they do and
don't get used. Common angles include vegetarians not wanting their stuff used in relation
to the meat trade... you get the picture.
However, the royalty collection
societies don't have the resources to police all the potential preferences of each
individual rights owner. So they operate a number of "blanket licenses" which offer a
general set of terms that many owners can sign up to.
You don't have to take
these terms if you feel strongly enough about something they might license on your behalf.
But they'll tell you the precise ins and outs if you get in touch or join up.
PRS, MCPS and PPL all operate blanket licenses, and your music library itself may
operate blanket licenses too.