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 First Sea Lord (ISL), that Col Bevan will be given the necessary information; this file also contains a report on the German Air Force's (GAF's) preparatory assignment of aircraft units to deal with any British convoy for Malta on September 29; with an instruction from the Prime Minister (PM) to show Col Bevan.