If you want the most money for the car and are willing to invest the time, then you'll likely need to sell it privately. However, if you need it gone with minimal hassle, you could enter it into an auction - Anglia Car Auctions, Barons, Classic Car Auctions all do well with low-mileage classics. There'll probably be quite a lot of interest because, as you point out, few standard ones are left. However, Novas just don't seem to have the following of rivals from Ford or British manufacturers. There is a Vauxhall Nova UK club - I think the best way to get hold of them is probably via their Facebook page. In terms of value, there are standard low mileage examples advertised for sale at anything from £1100 to £2000. With a pretty enthusiastic modifying and race community you'll need to weigh up whether you'd like to see the car kept standard or not.