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: Naval Headlines for February 4, covering anti-aircraft defences for Santo Stefano port; of an Allied attack on February 8/9; Naval Headlines for February 9, covering German views of a likely Allied attack on Santo Stefano; and on Southern Europe: of the results of Allied air raids on the ports of Piombino and San Stefano, on February 8-10.