This quirky shop sells both books and hats, and is utterly delightful. They're committed to hosting literary events, as well as "book clubs, literary study groups, break-into-books groups and creative engagement with GCSE and A level groups."
Based near Paddington station, you can float merrily on this Dutch barge, while checking out their selection of second hand stock. They also host readings and live music on their roof stage. Delightful!
Open since 1879, Blackwell's can serve all your bookshop needs. Seriously, if they don't have it, well, maybe it's not worth reading. If you won't be able to make it to Oxford soon, then take a virtual tour.