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 orders to prevent losses of aircraft on the ground due to air raids on October 10; of details of the supplies and reinforcements required by German forces in Africa on October 8; on forward movements of Allied reinforcements; of estimates of the Allied aircraft shot down; and the Prime Minister's (PM) instruction to C on the release of information to Middle East forces, on October 12.