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: of German Air Force (GAF) questions on the Bone air defences (see 2829 above) on April 4; that the 10th Panzer Division is strained to the utmost, on April 4; and that the GAF Stuka unit is on 2 hours' readiness on April 6.