At that mileage it should have had it's second cambelt change, if not then I would set aside £500 ish for that and all ancillaries. The early 2.5's suffered very bad cam wear, but hopefully by 2002 that would have been sorted.
Fuel pumps and turbo's are 'generally' good for 150k, so either of those could become a concern, and has a 'possibility' of a £500- £1k bill depending on circumstance.
Great cars though, so don't let any of those things put you off! Just study the service history carefully and adjust your offer accordingly.