If you dispute Subaru's decision over the warranty you bought with the car and over the fact that the car has suffered a serious fault within six years of purchase, you can sue the supplying dealer.

First you will need to get three competitive quotations for repairing the damage so you can sue for an amount of money. Then, starting with www.moneyclaim.gov.uk, take your case to the small claims track of the county court.

You can check the law here: www.honestjohn.co.uk/faq/consumer-rights/ I'll enter this in www.hoenstjohn.co.uk/carbycar where I think there's another case of something similar with a Subaru.