Off-topic, but wow there were some good used bookstores in Brighton. I think I know the one you mean, but the quirkiest was the one with a massive pile (literally a pile) of unshelved, uncategorized books in the basement. Hardbacks were £1, paperbacks 50p. It smelled faintly of mould down there, and there were some chairs and beanbags (the beanbags were too dodgy for me to sit in, lol) around the edges, so we'd sneak in cans of beer and spend the afternoon going through the pile and reading what we found. Once or twice the owner shouted down the stairs that he was going to the pub and to turn off the lights and make sure the door was locked when we left.

Sometimes I miss being young and poor. I'm not sure I'd enjoy spending a day like that anymore, and I'm not sure why.