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 contains a message from C to the Assistant Chief of the Air Staff (Intelligence) (ACASI) with the Prime Minister's (PM's) query and the Chief of Air Staff's reply on aviation fuel at Castel Benito; this file also contains a report on North Africa: that the German Air Force (GAF) demanded aviation fuel be transported by submarine if air transport is impossible, on November 26.