Thanks for the info everyone...
'Dave Sparks'...."You might mean you have a three position switch, On High, Off, On Low. If 'single pole' this may have three terminals, one to have the live feed 'in', one to feed out to the high speed, one to feed out to the low speed."
You are correct Dave...I told you I know the Square root of nowt as regards electrics.
Yes there is a light in the carling switch, both for night illumination and for indicating operation.
'Bowie 69' .... Yes I'd thought about a manual off switch as well for the precise reason you state.
'Fridge Freezer' .... Thanks I now get the switching thing....I think.....but can someone out there help me out with a complete diagram as how to do this like i said....Electrics = Numpty.
TTFN.....in anticipation.