Paul,
I've seen them DIY video's before and they certainly rang true to the theory that:
There are those that DO it and there are those that write about it!. [Linked Image]
I have had the same problem, in Ashburton, with people getting library books that are written to the UK Wiring Regs and I have had many a confusing phone call asking questions about BESA boxes and Consumer Units.
I must say, I know what a BESA box is now anyway, if nothing else!. [Linked Image]