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: the Tunis Air Corps' report for March 1; Naval Headlines; and from the Brazilian ambassador in London, a summary of a conversation with General de Gaulle at the Air Minister's dinner in London on February 23, giving considerable detail on the Casablanca meeting and developments in France and French North Africa.