The water pump for the mk3 golf is £21 plus vat from gsf.....
i got mine done last week along with my timing belt....
New water pump,
Timing belt kit
new alternator belt
throttle body cleaned
coolant
parts and labour came to £183,,,,, not bad..... vw wanted £300

this was in newcastle by a local vw specialist... Barry Swift... he's in the yellowpages if anybody wants to use him,,, i highly recommend him...