Quick google throws this up (extract) Final right to reject – the first six months If you have had the car for more than 30 days but less than six months, you have to give the selling dealer one attempt to fix the fault before moving to reject the vehicle. If the repair has not fixed the fault, you can reject the vehicle. If you part-exchanged your old car on the new one, you will not get it back. Instead, you will get a cash value for the new car. However, unlike the short-term right to reject, it may not be the full value. In this instance, the dealer is able to claim a reduction in the value of the vehicle. This is based on the mileage covered and time elapsed. There is no guidance on how much they can charge you, so be prepared to negotiate this with the dealer. If it goes to court, the judge will decide. As above, it is the dealer’s obligation to collect the vehicle under the Act. You cannot be charged for return costs or be forced to return the vehicle yourself. Full story http://www.thecarexpert.co.uk/rejecting-a-car/ Seem no compensation for additional costs. HTH