I'm certainly going to join up, it costs £20 for a year and you get a copy of the book with details of all the hosts in the UK (I'm sticking with Scotland though). You can view a brief preview of the hosts on the website though, and it seems to give some indication of where the hosts are coming from and what to expect.
I'll take your advice and go for smallholders, I don't want to spend my week learning how to make silage! (do I?)
I'll keep posting updates!