Thanks for the links,
The prospect of having to splash out £16.20, led me to remove the 2 speed heater switch and also the 2 position head light switch as a reference.
After dismantling, cleaning and reassembling, the 2 speed heater fan switch now works as it should and even more remarkably the headlight switch that I took the risk of dismantling, somehow went back together and works as well as it ever did.
Thanks to this thread for spurring me into action!
