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: from Sir V Mallet in Stockholm to the Ministry of Economic Warfare, detailing Germany's dire petrol and oil situation, on July 15; and from the Japanese consul-general in Vienna, describing the state of the oil-refining industry as the results of air raids, on July 10.