WOOOOO HOOOOOO
Guys I forgot to say that this problem is fixed!
I do feel rather stupid though... it was the connection behind the drivers side mirror. 
So I wiggled the wires and voila, it started heating up! As did the rear screen and the n/s mirror.
This was all on Christmas evening.. Best xmas pressy I got 
I have a feeling that the mirror had received a hard enough clump from someone to make a poor connection... what a shame I didn't check this sooner! I literally checked everything else!
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07 Silver D3 A/S8L Quattro  S8 front end, Xenons, Bose, Bluetooth, Voice Control, Autodim mirrors, Heated folding mirrors, Double Glazed Windows, Electric Rear & Side Blinds, Black leather Comfort Seats with front memory seats & mirrors, Front & rear heated seats, Interior/Exterior light pack, TV.I.M, AMI, Parking sensors Front & Rear, Air suspension (soon to be lowered), Keyless entry & Start/Stop, 4 zone climate control, Power Boot Open/Close. 
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