gaz i had a look,
the switch is in the lock mechanism, i don't know about your car but mine has red lights on the bottom of the doors, if you push the lock in it goes off. the one for the lights warning buzzer works off that one too.
there are two torx head screws holding it on, pull them off and the wiring is in there. if you can't find it i can send you a pic.
sanj