Just in case anyone else has this problem with their D3 '8, I took Audrey to my local Main dealer for guided fault finding (1 hour only)
They found the problem to be the throttle control valve.
It was replaced today (again by main dealer) and all is now well. YIPPEE
Total cost (parts + labour) was £550.00 (+1 hour diag @ £115.00) so all in all £665.00 - not too bad. 
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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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