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: that the German Air Force (GAF) are to report to Kesselring on aircraft fuel and lubricant received from Tunis, on March 17; on GAF operations, reconnaissance and intentions for March 17-18; and on claims of successful local action by the German African Corps; and on the Russian Front: evidence that the GAF 5th Air Corps is on the Central Front and has not moved to Brussels, from March 18.