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 on West Europe: that the German Air Force (GAF) is to continue providing support to the Army Group B offensive, on December 20; on South-east Europe: a 21st Mountain Corps report, noting heavy Allied air attacks, on December 17; on South Europe: of the 16th SS Panzer Division being withdrawn from the front to be a reserve in the Bologna area, on December 16; on South-east Europe: of the 5th SS Mountain Corps attempting to keep open the Sarajevo-Brod road, and making a complaint to the Reichs-Fuehrer of the SS about Army Group E, on December 13; and on East Europe: that the Soviets are assessed as preparing for an attack against the 16th and 18th Armies in Latvia, on December 12.