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: on a dive bomber training course at operational readiness in case of an attack on the Danish coast, on May 30; on partisan activities in Yugoslavia, on May 29-30; and a German intelligence report of an improvement in the British supply position, from May 17.