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: from the Japanese minister in Sofia, describing Allied rivalry over the Balkans, on October 5; from the Portuguese Minister for Foreign Affairs, that the chargé in Budapest has an interview with the regent of Hungary, on October 12; and Naval Headlines.