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 Swiss Legation in Tokyo, detailing an Allied air-raid on Tokyo, on March 17; from the Spanish Legation in Tokyo, on an Allied air-raid on Tokyo, on March 17; and from the Ministry of Foreign Affairs in Berlin, German propaganda directives, on March 17.