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) with the Prime Minister's (PM's) query for the Chief of the Air Staff (CAS): on North Africa, and a German Air Force (GAF) report for May 24; with the PM's query and CAS's reply.