I'm desperately looking for a new car and am going to see av Volvo V50 1.8 SE 5dr Petrol 2005 05 with 71,000 miles and 3 past owners. It has has service history from main dealer and part service ...

At this mileage change everything. Waterpumps were vulnerable on VAG and GM/Fiat engines because the impellers were prone to break. I don't remember this problem on PSA/Ford diesels such as yours.