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 Air Staff Intelligence (ACASI), regarding the following reports with the Prime Minister's (PM's) queries on them: on North Africa, a German Air Force (GAF) report for July 19; with a query from the PM on claimed British losses; and further GAF reports for July 19; with the PM's queries; and the Chief of the Air Staff's (CAS's) replies on the coversheet.