Take it to Trading Standards and advise the dealership that you are doing so. You have all the evidence. I bet the dealer will take the car back and settle your agreement. At the end of the day the dealership won't want to lose its Consumer Credit License. If it loses that. NO BUSINESS

The reality is this... The dealer has committed fraud in order to obtain funding from the finance company for the deal to get paid out. Doesnt matter if OP was aware or not of the mileage issue, he / she has remedies. The OP needs out of this car. I suspect they are in neg. equality as soon they drove off the forecourt and will therefore be 'glued' to this car throughout the agreement. Even if the OP tried to 'trade in' he would only be Lumped and Bumped into a new agreement. And the process continues....

I have worked in the industry. When the dealer proposed the 'deal' to the finance company to be Underwritten, that dealer knew they would not have got the 'advance' they wanted from the finance company with 68,000 miles on the clock, hence why the dealer prop'd it at 38,000 to get the advance. Clearly the vehicle was overpriced. This is fraud.