Got the a/c serviced when I discovered it wasn't working but the guy who recharged the gas believes there is an electrical problem. He had a prod with a multimeter here and there and tested the fuse + relay then suggested the button on the dash is faulty.
I've had a look behind the stereo panel and the switch seems to be integrated with a pcb serving a few bits and bobs. Is there a simple way to short across the switch to see if that is indeed the problem please?