You don't say whether it's a private seller or a dealer, but you'll have more rights with a dealer. If there is a problem with your used car soon after you bought it - and that problem is not to be expected based on age or mileage - then you are entitled to a free repair or replacement as long as it's within 30 days. If you need further help, I'd recommend speaking with Citizen's Advice.

To see all your rights, go here: www.honestjohn.co.uk/how-to-reject-a-car-your-cons...s