Built above the abandoned Underground station Osterley Park, Osterley Bookshop was opened in 1967, and has been a wondrous place for bookworms and lovers of the obscure ever since. It features a wide range of second-hand books, from classics to children’s, almost all for under £10, stacked on top of each other in seeming chaos that only the owners seem to understand. What makes this bookstore truly special—apart from the fact that the station below with quite a history of its own (a gun emplacement during World War II, home to…