Thanks guys for your quick responses. The switch is the one advertised on the Finishline website (
http://www.finishlineaccessories.com...941aba4ce11f21)
There a up to 8 numbers on the back of this switch but only 5 terminals which are, I presume, Ign 12 volts, Earth, off, slow and fast. However I am not sure which one corresponds to which number and was wondering if anyone had a wiring diagram (similar to the Lucas wiper switch wiring diagrams).
George H.