I believe PG has been clearing books published pre 1923, even if published in London. Now I read about another case saying all books pre 1909 may be free of copyrigiht. I do not know if this will increase or decrease the pool of books. I believe that all books published after 1923 in England are still subject to copyright unless they fall into the 75 year death rule. What is the status of 1909-1923 books?