Just thought i would share this information as it might be of some use to help others.
The problem was the rear heated screen suddenly stopped working the other day so i check fuse and that was fine?
I checked the positive and ground on the heated elements on the rear screen and they were in good order and making good contact.
quick check to see if there was power to the rear screen and there was none.
I checked for power to the relay (drivers side boot panel) no power.
I then discovered the problem!
There was a wire trapped behind the torx screw, torx screw loosened off and as if by magic.
Let there be power!
Russel confirmed everything was in order
Hope this might be of help for people to check