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 North Africa: a Panzer Army report for March 11; two replies by the Chief of the Imperial General Staff (CIGS) to the Prime Minister's (PM's) queries; a Naval Headlines report of March 20 on German (the Admiral Hipper is going to Norway) and Italian activity; and from the Portuguese minister in Ankara, on a Turkish plan for an understanding between Great Britain and Germany to isolate the U.S.S.R. and Japan, on March 16.