find a bit of land you like and find out who owns it on the land registry
linky linkyJust get an OS map, learn how to read it for what you want (right kind of woods, source of water, no footpaths etc) and get walking. Now is a good time to be looking for places, it'll take you a few months to find somewhere good, and you'll be digging by the time the weather craps out.
...or you could just get to know the villij or burlish dudes... nothin like having your own place though.