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) were informed that a conference is to be held at Italian division battle headquarters, on April 19; on North Africa: that the GAF allocated flak reinforcements on April 19; and on a sea recce by GAF aircraft from Norway on April 18; and on Yugloslavia: a German ground forces report for April 18 and April 13-16.