The Consumer Rights Act 2015 makes the seller liable for all faults within the first 6 months, and potentially up to 1 year.
Buying a used car isn't without its risks, however you do have some rights as a consumer to protect you from any dodgy deals.
www.carwow.co.uk
The Consumer Credit Act 1974 will make the credit car issuer liable in full if you paid at least £100 of the purchase price by credit card (e.g. the initial deposit etc). In practical terms this means that the credit card issuer will fight your corner to make the seller pay for any repairs in the event of a dispute.
Hopefully, it won't get to that.