Well I have my car back finally, total bill is as follows:
Parts £360 (Belt, both idlers, tensioner, water pump, aux fixed idlers, spark plugs, cam and spark plug well gaskets)
2 New front tires £210
Wheel repair £75 (thanks to Clive at CGtrading for giving me the confidence to go ahead with that instead of just selling a wheel to me).
I have advisories on my rear tires (inside edges worn), front pads (worn both sides on the inside pad - why just the inside?), slight leak from a pas pipe and it was pointed out that mt hand brake cable will need changing soon.
I am glad I didn't try to drive the car any further than my specialist, by the time he got the cover open one of the idlers was leaking grease and the belt was so loose he pulled it off with his finger. The last belt change was done by an Audi dealer and the timing was half a tooth out (incorrect tools/method?).