By 'eck! I thought I had asked a simple question I have no idea about 'piggy backs', 'earth switched; or 'live switched' I have a wiring diagram and a multimeter. The only thing I have done recently is change the light bulbs. Apart from that, everything has worked just fine since I bought the car a year ago, so I don't thing there is a fundamental wiring error. I was just a bit curious, but having changed the fuse, and everything is working again, I am a very happy chappy