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 Director of Military Intelligence (DMI): on a North Africa German Air Force (GAF) report for April 13 on British tank losses with a query from the Prime Minister (PM); and a GAF report of a British raid with losses on April 13; the DMI's report on losses on April 16; the PM's comment to the Chief of the Imperial General Staff (CIGS); and regarding the DMI's report on losses on April 16 and the PM's comment to the CIGS, the CIGS's minute to the PM.