Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence

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: BONIFACE reports from the Code and Cypher School (CSS) to the Prime Minister (PM); BONIFACE/SUNSET reports from the CSS to the PM; a letter dated January 3 which makes reference to Frozen 1031; a special unnumbered signal, dated January 1, for C from Martin, referencing Frozen 1031; two copies of a draft signal concerning the Irish minister in Rome; an abbreviated air situation report for December 30; on Southern Europe: of the damage caused by an Allied air raid on Nice, on January 2; on the Russian Front: of the reaction to Hitler's orders concerning the merging of administrative and supply services as part of economising personnel, on December 31; on South-east Europe: that the German Army authorities attach the greatest importance to supplies going by sea to Zara and Sibernik, on December 28; and from the Irish minister in Rome, describing the Italian political situation, as at December 21.