Update; had the whole sunroof switch assembly out today. I didn't realise that the switch is all part of the control electronics, now I realise why they're so dear on Ebay! There's no part number on the black box of the electronics just Webasto but the sunroof trim has a GM part no so I'm guessing that the switch is all one assembly? We had the electronics box apart and wedged something behind the floppy switch so that now it's all back together again it works and works quite well but if anybody's got one I'd still like a decent one to replace it! Ta.

Humpy