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 correspondence: from C to the Prime Minister (PM) with the gist of a German secret service report based on a report from the Spanish ambassador in London; from Anthony Eden to the PM on the action to be taken, on October 9; and a note to C with internal comments on the same or related material, from October 9 (an extract).