Well. I would GUESS around £40 for a water pump, a similar labour charge as a cambelt... whats that? £100, £150?

I'm sure there are people on here much better qualified to answer the question.

I dont think the car absolutely NEEDS a water pump, but its started to weep a bit so it will need one sooner or later.

I know the car pretty well, so PM me if you have any other questions.