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: a Naval Headlines report on German and Italian activity; the Italian minister in Lisbon reports on anxiety regarding Mozambique, on March 13; the Japanese minister in Sofia reports on Soviet designs in the Middle East, on March 18; the Polish representative in Berne reports on German reinforcements for and losses on the Eastern Front, on March 24; and the Turkish chargé d'affaires in Teheran gives the views of a U.S. colleague on the war and reports on aid going to the Soviet Union through Iran, on March 22.