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 the Mediterranean: the Ground Officer Commanding (GOC) the 164th Division's situation report of March 25 including an expected Allied attack on March 27; on a proposed move of the battle HQ of the 21 Corps, on March 26; that the failure of an attack on an Allied convoy was considered to be due to poor navigation, on March 26; a German naval summary of operations in all theatres on March 25; and Naval Headlines.