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: a BONIFACE report for the Deputy Prime Minister (PM); a BONIFACE report for Mr Loxley; a BONIFACE report for Lieutenant-General Sir Hastings Ismay; on the Russian Front: that bulky cargoes for Crimea are to be eliminated owing to a drop in transport performance, on December 27; a signal of December 30 at 2250 from Hollis for C and Ismay, including references to operation OVERLORD; two copies of a typed note for Hollis from Ismay; and a signal of December 27 at 1930 (local time) to C from Hollis for Jacob including references to Colonel Warden, that operation SHINGLE is scheduled for January 20, 1944, operations OVERLORD and ANVIL, Eisenhower, Montgomery and Christopher.