OK, been out and looked at it tonight...

I will be taking the new live from the battery down the passenger side of the car, thru the boot and taping it in with the OE wiring as it comes along the rear panel. I'll then replicate the original routing of the wire under the car - that way the spare wheel can't rub on the new wiring etc.

What have people done to replace the earth connection? I'm thinking of using the strengthening rib inside the boot at the rear of the rear wheel well - is this OK?

Cheers!

Neil.