The Book Barge now has a semi permanent berth on the canal behind Kings Cross station in London, I believe (they have a facebook page with their location on). From the second link posted by Melodious - I've been to a few, so I hope the following helps a bit! The Ross old book shop in Ross on Wye I was lucky to visit in March - its a great shop with a wide range of old books. Some quite expensive of course but I found some bargains. Baggins Book Bazaar in Rochester is a lovely old shop with lots of rambling passageways - quite easy to get lost in there (and spend quite a long time looking at books obviously) The Honesty bookshop next to Hay Castle in Hay on Wye is a lovely idea - but when we called in there was nothing of any interest and everything looked a bit damp and curled (its open to the elements, somewhat)! But it is very cheap and close to the other bookshops in Hay, so worth a look. Wild and Homeless Books in Bridport looks nice but is a total mess - 2 floors of books that weren't sorted in any order at all when I was there in May. Really disorganised. If you have the time to look at piles on the floor, on shelves, in boxes to try and find something you're interested in, then you'll be fine - its the only secondhand shop I've hated. If I may recommend my favourite - Astley Book Farm in Bedworth, Warwickshire. Converted farm buildings, 70000 books, a fantastic cafe, leather sofas and chairs dotted around and a wood burner in the winter (ultra cosy). I probably go about once a month and never come back empty handed (or well fed).