Indeed, if you go to section 1 - schedule 4 articles 16(9) and 19(2) you will find the equipment required.
It may also be worth looking at section 2 - section 6 for the Instrument flight rules. I'm still amazed at the amount of pilots I meet that are qualified to fly IFR that are clueless as to what the Instrument flight rules actually are.
You can view all this on the CAA site, just do a search there for CAP393 and take it from there.
Cheers