Thanks for your reply! It seems that it's most ambitious wiring job I've ever done too!
The parts should have arrived by Friday.
Here goes! :electric:
Have a look at youtube - there are some good vids showing you how its done. Its actually pretty straight forward and logical when you get you head around it. The inside of my box doesn't look quite as neat as the one in the piccies posted above, but from the outside you'd never know, and it works a treat.