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 correspondence: from the Japanese ambassador in Berlin, describing the European war situation, as at July 6; from the Japanese Minister of Foreign Affairs to the ambassador in Moscow, stating the need to pursue good Japanese-Soviet relations with the war situation growing ever more serious, on July 8; and from the Argentine ambassador in London, detailing a flying bomb attack on London, on July 10.