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 Turkish ambassador in Moscow, detailing an interview with Molotov, and regarding Soviet territorial ambitions in Turkey, on June 8; guidance from Ankara, on June 12; and the ambassador's reply, on June 13; Naval Headlines, for June 16; and a further Naval Headlines report.