How much does a cambelt change cost?

What is the average cost for changing the cambelt on an A3 2018 Sportback 1.6 petrol engine?

Should I change the cambelt on my SEAT when I change the water pump?

My 2019 SEAT Arona (18000 miles) water pump is leaking. When I get it replaced should I do the the timing belt at the same time? I have been quoted £899 is this reasonable?

When should I change the cam belt on my Audi TT?

Can you tell me when I should replace the cam belt on my Audi TT? The dealership are advising it needs changing now as it is five years old - is this correct?

When should I change the cam belt on my SEAT Ibiza?

My 2009 SEAT Ibiza is coming up for its service and I have been informed a cam belt change is required. Is this right? I’ve only driven 25,000 miles and the books says it doesn’t have to be changed until...