Thanks chaps, I will look later. In actual fact one of the kids was playing with the electric seat,up, down and back, after telling him there was more to life than peee ing Dad off at every opertunity (he`s 12 and seems to think life is one big test of dads patience) I looked and found that the Amp? or something to do with the radio was loose and bouncing around on top of the other box. I think the wire must be loose and I will have a tinker later.
Many thanks