Use this document to demand a refund from a dealer for a vehicle that has developed a serious fault within 30 days of purchasing and taking delivery. You should include with the letter a report from an independent organisation, confirming that the vehicle has been examined and found unfit or unsafe to drive. Under the Consumer Rights Act 2015, you are entitled to a full refund of the purchase price from the dealer, and this letter will threaten court proceedings if no refund is received.