My son in-law bought a 2008 Vauxhall Vectra 2.2 petrol from a dealer four months ago. The car broke down the day he collected it with a failed fuel pressure sensor. The vendor paid for a local garage to replace the sensor, but now four months on the car has the same problem again.

Research on the internet reveals that the pump may be at fault as well causing the sensor to fail. The selling dealer denies any responsibility, but surely he cannot deny that he sold my son in-law a car with a fundamental fault which has not yet been satisfactorily resolved. Where should he go from here?