I'm afraid I had been getting my Front and Rear Heater Buttons mixed up.

I thought the button with the Pie Shaped Screen was the Rear and the Square Screen the front however whilst changing the Rear Heated Screen Relay (No 25 in the Central Fuse Box) it appears that it was working all the time (the relay that is)

When I press the Square Screen Button (Rear Heated Screen) the relay clicks and the light comes on (The engine has to be running) but the rear screen does not heat up.

When I press the Pie shaped button (Front Heated Screen) there is no click the light on the switch comes on and the internal lights visibly dim. They do not dim when the Rear Screen Heater is switched on.

I have changed the Relay and the Fuse but the Rear Heated Screen is still not working any idea how to test from here, I have a multimeter and I'm not afraid to use it !!!!

Ta