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: intelligence on German Air Force (GAF) plans for fighters to operate in North Africa with long-range tanks from March 7; a GAF report on reconnaissance and intentions to attack on Suez on the night of March 9-10; intelligence on a GAF transfer of bombers in the Mediterranean to Catania on March 8; and a report that the German 51st Corps had been driven back on the Russian Front, from March 8.