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: that a heavy air raid is planned against Capuzzo, on May 6; on Kesselring's plan for an air borne attack in North Africa: that all preparations are to be completed by May 20; and a German secret service report on new Soviet divisions being unprepared for gas, on May 4.