Any advise. I bought a used DS4 8 months ago on an eleven plate. I paid £300.00 for a warranty. The car had done 42 thousand miles. Last week the radio/sat nav-etc stopped working . I took the car to Citroen who tell me that the radio has had it and I need a replacement at £800.00. As you can imagine I was shocked to say the least . Am I being ripped off . I rang the warranty and they say although they cover electrical faults this does not include the radio. Conned again. Is £800.00 right?. The dealer is Citroen of Newport.