These warrenties are really just insurance policies that pay out in certain circumstances. Quite often they will write the car off and give you some money. A 14 year old 600, regardless of condition will probably have a book value of no more than £500. In most cases they are not worth the paper they are printed on and certainly not worth it for anything over 10 years old. You'd be better opening a savings account and putting the cash in it for a rainy day.