I've used Jay Cars in Sutton twice before, once for a minor bumper scuff and another for a major accident claim (done privately). In terms of finish it was as though it was from factory, colour match was perfect and clear coat was perfect too (i.e. no orange peel effect).
More importantly a year on from the repairs, the paint is still as solid as day one so it shows they didn't skimp on clear coat! Family run business so it might be worth asking for a quote?
