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: Naval Headlines; and from the Portuguese ambassador in London, regarding Eden's proposed visit to Lisbon, the Portuguese government would welcome Eden on the eve of any agreement being put into execution but considered that this was still some time away, as at June 23.