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 North Africa: of an Allied breakthrough; that the German Air Force (GAF) are to reconnoitre and attack tanks north west of Kairouan on April 12; and of Tunis harbour being repaired after its destruction on April 11; and on the Mediterranean: of Trapani harbour being damaged and ships sunk in a raid on April 11.