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 reference to the Prime Minister's (PM's) comment on the attached report, concerning North Africa: a German Air Force (GAF) operations report for November 19, describing ineffective British air attacks.