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 includes the following reports on North Africa: of the Tunis Air Corps' combat plans for April 23/24; and the Tunis Air Corps' aircraft return for April 23, counting 115 aircraft as serviceable; from the German Air Ministry: a circular of April 13, that breakdowns in aircraft production had led to certain German Air Force (GAF) fighter types being sent to units without or with only partial armour plating, and that cockpit diagrams would indicate from where armour was missing; on North Africa: of the combat plans for the Tunis Air Corps for the night of April 23/24, that 50-60 aircraft are to attack Allied forces in the vicinity of the front line in the Medjez El Bab area; and that GAF torpedo aircraft are at increased readiness to attack Allied naval forces in the Strait of Sicily, on April 22; and on the Russian Front: of the GAF's combat plans for April 24, including air strikes against the Soviet bridgehead at Novorossijsk and the Black Sea harbour at Batumi.