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 includes the following reports on North Africa: that the Axis is aware that the Allies have fore-knowledge of Axis intentions, on March 25; that the Axis realises that the times of attacks have been betrayed to the Allies, and that appropriate security measures are to be taken, on March 24.