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 South Europe: that the Chief in the Southwest complains of heavy vehicle losses due to air attacks, on April 23; on West Europe: that Hitler orders a leave ban for the area of the Chief in the West, on April 26; and Naval Headlines.