I thought I had RAVE in a hard copy and I have but there is nowt electrical helpy in there. A bit of searching however has turned up a link to the electrical side of things which is obviously an add on to what I've got. Very useful I think, found the heated front screen stuff on there which I'll print off tomorrow and see if I can get my head around it, electrics are not my thing really but I do like to learn stuff. Stretch the grey matter and hopefully ward off dementia for a bit longer.
I can't see the pages very well on my phone, which is all I have, but it looks like it is operated via the fusebox relays and not the becm, that runs the rear screen and works fine.