[pete-p]

Thanks for the replies. I think I've read almost all there is about the wiring there but was really hoping I could use the feed for the ambient lighting and connect it all in the one harness before fitting it in.

I may dig out my multimeter and see what the blue and grey wires do, perhaps that's where I need to look first. I saw mention of blue with red stripe being illumination so there could be a link there with the plain blue in the mirror harness... probably too simple though!