Document Title Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence
Reference HW 1/365
Conflicts Second World War
Themes Military Intelligence and Operations
Regions Africa, Europe
Countries Greece, Italy
Document Type Signals Intelligence
Organisations Government Code and Cypher School
People Not Defined


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 includes the following message: a response by C to the Prime Minister's (PM's) query relating to an item in the Naval Headlines, 202.


intelligence channels, wireless communications, communications interception, shipping, cyphers, American intelligence services, German U-boats, submarines, German navy, naval intelligence, Italian navy, Battle of the Atlantic, warships, convoys, torpedo boats

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