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 D-Day for the Leros operation being postponed to either November 12 or 14; that Allied destroyers bombarded Kalimno harbour during November 10; that an Allied bombardment of Kos on November 11 caused no German naval casualties; and a situation report on the ground, air and naval situations, for November 10.