Found this on another thread:
This say 80,000 miles page 5 (toothed belt replacement)
Depending on what mileage you do/how long you want to keep car I would be tempted to do water pump and get coolant done, this will be easily accesible when doing cambelt and a labour saving... coolant is 150,000 miles / 5 years service life
Make sure you do the waterpump when you are getting the belts done as above....
Cheers
A