Might be an idea to take it to Audi (or reputable independent garage) and asking them to do it for you. To me the cost would be worth it - no hassle and if they break anything then they have to put it right.
A reputable independent garage should charge around £400 +VAT for a belt and water pump change.
Audi (or any other main dealer for that matter) charge steep labour costs, as they have bigger overheads.
Thanks for that.
I'm just toying with putting new parts on my A3 Sportback, mainly because there has been some low-speed creaking since I bought the car at 2 years old. This has become more noticeable with age.
I don't know if I'll go for a complete change, or just renew bushes and top mounts...