well, it's just been replaced at 61k miles. I ended up with 3 quotes, all very close at £600. (Audi dealership, a VWAudi specialist and a general repair garage) All quoting using original Audi parts.
8 items were to be replaced.cam belt roller relay roller multi V belt belt damper x 2 water pump anti freeze.
It took approx 5 hours to complete.
£225 labour, £305 parts + the dreaded 17.5I opted for the VWAudi specialist for 2 reasons, I knew the Audi dealership would hike up the bill (from previous experience) and the specialist was sited close to family so could go visiting while work being done.
conclusion, a nice job carried out by a competent mechanic.
just before my car was due this work, a neighbour had his car belt(s) changed by a friend of the family, the car was up on blocks, in the drive, for 3 days and resulted in a second 'mechanic' finishing the job plus owner ended up also paying for an alternator that they managed to destroy at the same time.
dj (ps if anyone in Hampshire, UK wants to know the workshop please ask)