I bought a car from an independent car dealer at the start of July, which still had four months' manufacturer's warranty left. The car advert stated warranted miles and a full service history. Two weeks after purchase, I took the car into my local main dealer to get a windscreen washer unclogged. When they did the work they told me the car had a mileage discrepancy and, to my horror, the mileage at the last service was 70,000 more. The service book provided with car is also fake. I have spoken to the dealer I purchased the car from and stated I want a refund as the car is not as advertised. The dealer is refusing to give a refund, stating that they did not know about the mileage discrepancy and he is trying to contact the previous owner. If I go through Trading Standards and courts, is there any likely outcome or will this end up costing me in legal fees without any end?