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: that every seaworthy landing craft is to be employed in a supply operation to Tunisia, from April 29; that 1800 troop reinforcements are to be shipped to Tunis by 6 Italian destroyers, on May 1; of measures to locate and attack Allied naval forces when they are considered a danger to Axis convoys, on April 29; and a British agent's intelligence report from Tunisia, on April 29.