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: a German Air Force (GAF) Y service appreciation of the enemy aircraft supply ferried from west Africa, on July 21; of the Panzer Army's strained fuel situation, on July 21; that the 90th Light Division are to attack on July 22; and on the German Navy: a general summary for July 22.