Hi A2Look
The service schedule booklet which came with my 2001 TDi specifies a Timing belt and tensioner roller change at 60,000 miles. I understand this has been extended to 80,000 miles on later models. I personally would also change the water pump and alternator belt at the same time.
Audi seem to regularly change their ideas on a 'safe' service life for timing belts so I suggest you talk to your Dealer for the latest info. - As an example, I recently read that VW had reduced the belt change interval on the 1.4 litre - 16valve (petrol) engines from 60K to 40K miles.
Let us know how you get on
Cheers Spike