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 Navy at Tunis report the loss of supply ships, on April 1; of the loss of supply ships; the German Air Force (GAF) at Tunis' 3rd evening report, for April 1, describing effective GAF attacks; a GAF situation report for March 31-April 1; an Army Group Africa report on their tank situation, on March 30; and of the GAF's targets for April 2; Naval Headlines for March 31; and the First Sea Lord's (1SL's) explanation of a German naval mishap in the Bay of Biscay, on April 1.