"Door handle raiding"!
Thing is, I know exactly what you mean.
We should start making the official rendezvous points of local meets the nearest scrappy, seeing as we spend so much time plundering them for bits!
I've become known as "Mr.Rover-man" at my local one - I don't even have to ask before they point me in the direction of any new ones that have arrived fresh for the scavenging.
TC & Wasa are spot-on though: the only wiring that you need should be the short looms that handle the window and the central locking in each rear door. No programming should be necessary for a Mk1, and R45's use exactly the same bits.