Not an expert in this field, but I work in the finance industry, financing vehicles. I reckon you have a fairly solid case for misrepresentation under some facet of the Sale of Goods Act. I would suggest a letter to the Dealer Principal (ie the main man) where you bought it from, requesting return of the purchase price (if that's what you want?). Request a meeting (at your convenience) if you want. Allow a reasonable timescale for return of your money (14 days). If you get no joy with this approach, try a half hour session with a high-street Solicitor (often free) and ask them to write a Letter Before Action (LBA) to the dealer. If this doesn't prompt a response, you may need to have the vehicle independently inspected (find someone from the Yellow Pages) to confirm the exchange engine in writing, and then issue Couty Court Proceedings. Copy all correspondence to Land Rover head office in the UK. I'd be amazed if the dealer would let it get this far. It's all about kicking up enough of a fuss to let them know you're serious. Good luck.