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 April 27, stating that 124 serviceable aircraft are remaining; on the Mediterranean: of Grosseto airfield being hit by an Allied bombing raid, on April 26; and on the Russian Front: that the German admiral commanding the Black Sea area sees no end to the Soviet resistance at the Novorossijsk bridgehead, on April 21.