Hi thanks you for your speedy reply,
The knob is rotating within the houseing i have spoke to a specialist who has told me I need to undo the 6 screws at the top of the hob and the screws at the back enableing me to gain access to the switch... which needs to be replaced. all I need to do now is find out the serial # to order the part...
I think I have it under control, but may get back to you for further assistance if need be.
Many thanks for taking your time to reply to me
rb
March 2008