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) anti-aircraft units being transferred from Romania to the Ukraine, on March 3; reports of heavy losses of an SS division, on March 1; and a Naval Headlines report on German U-boat (in the North Sea) and Italian naval activity.