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 South-east Europe: of the results of Allied raids on airfields in Greece, Crete and Rhodes on October 10; and of the occupation of further Aegean islands being under consideration, on October 11; with the Prime Minister's (PM's) query; and correspondence between the PM, the Chief of the Air Staff (CAS) and the HQ of Mediterranean Air Command.