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-east Europe: that the Admiral for the Adriatic expects an Allied undertaking against Corfu, on April 9; that German Air Force (GAF) Command for the Southeast orders the development of the GAF fortress at Agram, on April 9; and Naval Headlines.