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 correspondence: from the Japanese ambassador in Berlin, describing conversations with Ribbentrop and Hitler on the future of the war and a second front, on January 23 and 24 - for the full version see 5674; and War Office comments on Hitler's figures for German divisions, on February 5 - for a different version see 5674.