Id want to see the pictures of the Cat C damage and work done to put my mind at rest, and also knock a few hundred off for it, even if its done to the best standard cars never have the same value.
Aside from that looks tidy, particularly the interior. Good service history, seems ok to me.
Ive bought some cars on ebay, I always try and get them at least a couple of hundred less than what i think they are actually worth, to take into account travel, and also small bits and pieces that can need doing on a car.
As for what its worth, its partly what you feel comfortable paying. I saw one go on ebay for 920 which tempted me, but im not flush at the moment, on a good day i might have paid up to 1300 for it.
16v's without Cat C seem to go between 900-2000!, seems to be on what the buyer is prepared to pay.