I bought a secondhand Volkswagen Golf for £5000 from a dealer. It developed serious power issue after two months. Dealer refuses to accept liability but offered to pay half the cost of repairs in his affiliated garage. I have rung him twice and sent two recorded delivery letters asking for repair, replace or refund. On phone he refuses, he doesn't reply to letters. Volkswagen diagnostics show poor compression and ignition on cylinder three and the power booster faulty, possibly a very pricey repair. What would you do? He does not belong to a mediation service. The car ombudsman says he is not part of their service. Do I go to small claims for £5000 or get it repaired at Volkswagen and claim back the cost?