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 a proposal for the modification of Me109 fighters to enable fighter-bomber application is not practicable, on April 25; and that the sailing of the Carbonello for Bizerta was suspended by the Italian Admiralty, on May 3.