Well little update - the car went in to Southend Audi last sat, and I drove home a 65 plate White A6 S-Line Ultra Auto. Never driven an Auto before but after a day or two - im loving it ! 7-speed, and pulls lovely!
Had a phone call on Weds from Audi, the gear lever vibration they couldn't fathom out, so have put a new clutch & flywheel in for good measure
The wheels are going to be re-furbished once more, and diamond cut properly (they were only painted last time, not diamond cut!).
So I have the White A6 for another week (unless they call Sunday to pick mine up).