Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence

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 contains a message from C to the Prime Minister (PM); and the following reports on North Africa: that German Air Force (GAF) operational orders for November 4 include convoy escort duties; that aircraft of the 2nd Air Corps attached to the 10th Air Corps are to revert on receipt of the cover word GIBRALTAR; and tankers have been directed to Benghazi because of losses at Tobruk, on November 2.