Last time my car was in the garage whichever mechanic was working on it couldnt work out how to switch the lights on or off, so bashed every button and removed a load of fuses.
When I got the car back the side light button was handed to me with the keys, and my horn didnt work.
Are the two at all related? I'm on the hunt for a Vectra light switch now but the horn is causing some concern... I've reseated the fuse and relays and that's my fault finding methodology thoroughly exhausted in ~2 minutes.