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 Hitler approved troop movements including further German reinforcements for southern Greece, on June 13; of proposals for new anti-landing minefields in the Ionian Sea, on June 14; and operations reports by German Air Force (GAF) Command for the South-east, on June 14; Naval Headlines; and from the Japanese ambassador in Kuibyshev on the Russian internal situation, as of May 31.