We have been told verbally that the boiler of the house we are buying had been serviced last year but when it came to actually signing to that effect they ticked that it has NEVER been serviced.
We had ours serviced in Aug 09 and had to provide paperwork to show that it was, same with the electrics.
We are replacing it anyway as it is a traditional boiler and we want the same as what we have here, ie a combi condensor. £5k for a worcester bosch to feed a 4 bed house with 3 reception rooms.
If the bailiffs have been round for your vendor you don't stand a very good chance of claiming any money back even if you can prove he lied. Chalk it up to experience and either have the boiler repaired or replaced at your own expense. Crapola, I know.