Q3 Looking for official advice on Q3 Quattro timing belt replacement frequency

Lovely though this forum is - for Q3 questions you'd be better off asking here: https://www.q3ownersclub.co.uk/forums/

And to your question - the answer was the 1st one that came into the salesman's head - he'd have also not told you that normally the tensioner and water pump are replaced at the same time. Avoid that dealer.

The handbook will quote the Audi recommendation. You have a similar generation and engine car to mine and so I would guess that the handbook might well quote something over 100,000 miles. However, Audi UK dealerships introduced an overriding 5-year condition sometime between 2010-2015 which recommended the change should be conducted upon the first to occur of the mileage in the handbook or the 5-year period. Many previous discussions on this forum have shown that in other countries across the World, this 5-year condition has not been added. As you say, I find waiting for 100,000 miles uncomfortable. Audi do fixed price servicing for non-brand new cars and the belt & waterpump costs around £700 (for my car) with quality OE parts and a 2-year guarantee.