“Invasion 1940 What If?”, by Tony Eaton.
From The National Archives: “Historians are divided about whether a German invasion could ever have succeeded. In the end, it never happened but [there was] some indication that the British government seriously considered that there might be an invasion.”

Meeting begins at 8pm in the Wellcome Great Hall, Town Hall, Berkhamsted. Visitors are always welcome @ £3 at the door.