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 contains a message from Group Captain Winterbotham to the duty officer in Hut 3, including various intelligence items on the western Front and the eastern Mediterranean that were retransmitted to Churchill at 0900z and 1800z. This file also includes a Naval Headlines report; and a Secret Intelligence Service (SIS) report on German information from Lervas' entourage, on October 8.