The cam belt on my limited edition Clio RenaultSport Gordini has failed, causing catastrophic damage to the engine. The garage have indicated it requires a new engine, with a rough estimate of £7500. Renault say it's not economical to fix the car and have offered me £1000 towards a new car or a used car up to three years old.

The cam belt should be changed at six years old/60,000 miles. My car is almost six years old with just under 24,000 miles on the clock. The garage have indicated the cam belt would have been changed at next service. I want to repair my car and I want Renault to cover the costs of the parts. Is this something I can argue the case for, and are either the garage or Renault liable for the failure even though it is out of warranty?