We've had a push on/off and turn dimmer switch controlling the ceiling spotlights in the kitchen since I changed it about ten years ago. About eleven O'Clock last night, my wife said it wouldn't turn on and she was right. Pushing the knob in you should hear a "click" as the swich operated and it didn't. I said I'd look at it in the morning. I suspected the latching part of it had broken.\nI checked on-line for the price of a new one in brushed steel and it was eighteen quid.\n\nAnyway I was about to take it off this morning, when I noticed the nut that secures the knob and switch to the backplate was loose. So I tightened it up and the switch worked again. Because it was loose before, you couldn't push the switch in far enough for it to operate. I guess with constant use of the dimmer function, the knob as it was turned had undone the nut a few turns.