As soon as the Hyundai dealer gets the car he will know what is wrong. Hyundai warrants clutches for two years, which is 18 months longer than anyone else, but whether it is covered depends on whether the Hyundai warranty itself is intact.

If not, the car supermarket is liable and will accept liability and will offer either to have it fixed or to return your money. They are generally very good about this. Your rights are here: www.honestjohn.co.uk/faq/consumer-rights/