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 the 15th Panzer Division being reinforced, on March 30; of measures to restore the serviceability of German Air Force (GAF) unit KG26, on April 4; that Army Group Africa are to return the hulls of unserviceable tank IVs to Germany, on March 30; and of the GAF's intentions for April 4; on the Mediterranean: that GAF Sardinia request ME210s for the reconnaissance of Algeria, on April 3; and on GAF photo-reconnaissance of all Allied harbours on April 5.