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; from the Japanese minister in Sofia, forwarding Bulgarian information on peace moves at the Vatican, on March 24; and from the Japanese minister in Madrid, giving the Spanish view of the U.S.' war policy, on March 31.