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 correspondence: intelligence on German reconnaissance reports of British aircraft numbers in North Africa; the German supply situation near the River Dnieper; a report of a convoy leaving Naples for Tripoli; a message from the Italian minister in Teheran reporting the Iranian view of the war in Russia; and a message from the Japanese ambassador in Berlin seeking guidance on American-Japanese negotiations and future Japanese policy. This file also contains a Naval Headlines report (number 61), covering German and Italian naval activities in the Atlantic and the Mediterranean.