Update - 2 auto electricians just spent an hour at it. Said the installation was a bit ropey (but they would eh?), snipped a few wires and low and behold we have life!! Engine starts, stereo on, air con on, dash lights on BUT........ No lights, hazards, full beam, indicators, tail lights (brake lights DO work), no central locking and no electric windows!! After more poking they ask me to drive it up to the workshop tomorrow morning. Minute I walk away from the car, lights come on...... wont switch off at the stalk!! So had to disconnect the battery to stop it running flat over night.
They were thinking body control module? Please someone tell me this isnt expensive!