I've been to London twice and have seen most of the major attractions that interest me (listed below for reference). In late May I'll have a 2-night stopover en route to another city in Europe. What are your favorite hidden gems for a third-timer? I have a special interest in British history from the Anglo-Saxon through Tudor periods, as well as British literature, so any sights along those lines are a plus. TIA!
Have visited: Tower of London, British Museum, V&A, British Library, Westminster Abbey, National Gallery, Courtauld Gallery, Hampton Court, Hyde Park, St. James' Park, Borough Market, St. Paul's Cathedral, Portobello Road, Greenwich, Hampstead