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: that night fighters are requested to protect Benghazi against increasing RAF raids, on April 4; on the urgent need to replace stocks of Flak ammunition; and that the delivery of replacement aircraft to southern Russia is to be discontinued because of the fuel shortage and unserviceable airfields, on April 3.