A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following reports on North Africa: the German Air Force (GAF) at Tunis' 1st evening report for April 10; GAF Tunis' 3rd evening report for April 10; and GAF Tunis reports an enemy advance on the Fonndo U.K.-Kairouan road; and Naval Headlines, covering U-boat activity in the Atlantic.