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: on details of German equipment shipped and to be shipped to Africa in May; that German tactical exercises without troops are to be held at Derna on May 22-23; and that the German Air Force (GAF) Africa requested for the exercises at Derna to be postponed to May 24.