Listening to Britain: Home Intelligence Reports on Britain's Finest Hour, May-September 1940

From May to September 1940, a period that saw some of the most dramatic events in British history - including the evacuation of Dunkirk, the Battle of Britain and the opening stages of the Blitz - the Ministry of Information eavesdropped on the conversations of ordinary people in all parts of the United Kingdom and compiled secret daily reports on the state of popular morale.