Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence

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 correspondence: a telegram for Air Cde Spencer, an alias for the Prime Minister (PM) visiting the Middle East, via Admiral Cunningham, with an ULTRA (BONIFACE) summary of intelligence; and the following reports on the Mediterranean: the German Navy report the results of an air raid on Olbia, on May 24; on an air raid on Olbia, on May 25; a provisional report on the Olbia raid of May 24; a report on Olbia, for May 24; that owing to the inadequacies of Italian fighters the German Air Force (GAF) are seeking the transfer of a GAF fighter unit to northern Sardinia, on May 24; a German report on an air raid on Reggio, on May 24; of German anxiety regarding the defence of the Straits of Messina, on May 24; of damage caused by Allied raids on Messina, on May 25; and that Hitler directs that German units from Africa are to be kept as complete units in Italy, Sicily and Sardinia, on May 24; on Greece: that a German diplomat told Hitler that the Italian forces should be withdrawn, on May 23; from the Japanese minister in Budapest, on Nazi party politics, on May 15; and from the Japanese minister to the Vatican, giving the Vatican's views on the Italian situation, on May 19.