You'd expect me to say this but please try http://www.ybw-boatsforsale.com instead (you can also access it via the Boats for Sale button on the bottom nav bar). Over 2000 UK boats for sale, several thousand more across Europe. Quick search page will give you a reasonal result - try advanced search if you want to specify things such as build material. You can also register for e-mail alerts for new listings of your chosen criteria on the Personal Boat Shopper service.
You can also search the private classifieds on Motor Boats Monthly, Motor Boat & Yachting, Yachting Monthly, Yachting World and Practical Boat Owner via the Boats for Sale button.