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: Naval Headlines, covering Italian and Spanish activity; from the French ambassador in Tokyo, a Japanese communiqué on war losses and successes, as of June 1; from the Italian ambassador in Tokyo, on Japanese operations in China, as of June 3; and from the Turkish minister in Madrid, on an Italian warning of a British attack on Turkey, from June 3.