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 messages: from the Turkish ambassador in London, on Eden's visit to Washington and the state of U.K./U.S. relations, on March 13; and a minute from C to the Prime Minister (PM) accompanying the above item from the Turkish ambassador and dated March 21 - the item was being sent by Sir Orme Sargent of the Foreign Office for the perusal of the PM before the PM's meeting with the Turkish ambassador.