We bought a 59 plate Discovery 4 from a franchised dealer with a 12 month warranty and service pack, approx. 13/14 months ago. The car has suffered from engine and gearbox problems for the last 7-8 months of warranty and despite dealers attempts to fix in warranty, problems persist outside warranty. I worry about my wife driving an unreliable car and following the fifth occurrence of engine and/or gearbox faults I am losing faith in it. Can I reject the car or do I have to allow dealership to persist with attempts to fix it? The car was 50k miles on purchase and it now has 75k miles.