Hi Stuart
Here on the PSSA website is probably the best place to sell a 22.
Can you post where the boat is, a member close to you with knowledge of 22's may be able to have a look and help with a guide price. From the site here you may have noticed others for sale, £2,000 to £3,000 is normal but engines, trailers and gear will affect price as much as the boats condition.
Philip