Book Fair turned out to be a small but charming affair, held in Pevensey's community hall. Pevensey itself (or possibly Westham; I wasn't sure where one ended and the other began) is a little village (or possibly two little villages), with a high street consisting of the occasional hairdresser's, a pub or two and a post office/local store. But it does have a large, crumbling castle, or at least it looked large from the outside. In fact I discovered you can walk through the grounds of the castle when I headed back to the station after the fair, and rather nice it is too. I peeped into the keep but didn't pay to go in, being a cheapskate. Another day, perhaps.
As for the fair, there were maybe fifteen dealers there, and after one circuit of the hall I thought I'd be done in five minutes. But after another circuit I came across a couple of Dennis Lehane first editions (Mystic River and Shutter Island) and an Arthur C. Clarke Pan paperback (Childhood's End) we need for a book on cult books we're putting together at work. All three for a tenner, and a pleasant chat with the seller into the bargain.
Besides myself there were maybe twenty people circling round, mostly older folk. It kind of reminded me of a toy fair I went to once in Orpington (don't ask). So, worth going to this one time I guess, but I won't be making the trip again.