actually, it's not so simple - you might remember during high winds some years ago there was a new phenomon whereby a lot of kids outdoor trampolines were being blown about (they'd just become widely available). The owners' house insurance companies insisted that the car owners' insurance companies actually paid out, as comprehensive car insurance covered such damage.
However, it seem in this case that a quote for �130 was given, and it ended up as �300. If the car owner is a close neighbour, and there's a friendship, they could possibly come to some arrangement.