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 BONIFACE reports: on instructions from the 4th Air Fleet that all reports from photographic reconnaissance were to be expedited from January 3; and that the Close Support Unit at Mariupol was reporting extreme cold and so there was no prospect for operations on January 4, and was concerned over the protection of airfields on January 3.