How much would I expect to pay to change a waterpump on a BMW 316i 19999?

whoops, 1999 and I am in the UK.How much would I expect to pay to change a waterpump on a BMW 316i 19999?Its a BMW in the states that would be right.But are BMW parts cheaper there.thats about 300 U.S.probably not to bad I'm sure a/c is in the way and everything else too.I would say that is a fair price for guaranteed work.How much would I expect to pay to change a waterpump on a BMW 316i 19999?best guess ALOT!!!! Good Luck