I don't think I've written specifically about a second hand book store in UK before, only partly in this post. This shop is very interesting
https://peakd.com/hive-168869/@livinguktaiwan/an-overdue-reunion
We have a lot of charity shops on UK where people donate unwanted items to charity who resell them and the proceeds goes back to that particular charity. Books are popular donated items especially fiction, there's normally a few shelves full, sometimes more, and them they would normally be categorised by subject, cooking, gardening, history, nature, travel etc. These are some of the Brits favourite topics
Next time I come across a good second hand book shop I'll make sure I do a post for you!!