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: of preparations by the German Navy for demolition in Kairouan, Sousse, and Mahdia, on April 8; of German Air Force (GAF) flying unit transfers, on April 9; GAF Tunis' 2nd evening report for April 8; and GAF Tunis' 1st evening report, including flying unit transfers, for April 8.