If a fault comes to light between 30 days and six months of buying a vehicle, you’re entitled to a repair, replacement or refund. It’s assumed in law that the fault was present at the time of purchase unless the seller can prove otherwise.

Unless you’ve agreed otherwise, the seller (dealer) has only one opportunity to repair (or replace) the faulty vehicle after which, if they fail to repair it, you’re entitled to a refund. But the seller may make a 'reasonable' adjustment to the amount refunded by taking into account the use that you’ve had of the vehicle.

For example, if you successfully reject a car for a refund, the dealer may take off the cost you'd have paid if you rented a similar vehicle. So, if you had a car for three months, and the typical monthly rental cost of that car is £200 - they could rightfully take £600 off the refund you receive.