As a lot of Trophy's mine is coming up to being 5 years old (50k miles) and due for the cambelt to be changed. Is it worth changing the waterpump while at it?
The waterpump is driven off the Aux belt, are you changing the Aux belt too ? If you can afford to change it you may as well but I dont think you will have any problems with it if you dont.
Ive heard that changing the Aux belt can put extra strain on the water pump when its re-tensioned. Ive not heard of many failing though especially below 72K, thats when i would change mine.