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 report: a German Air Force (GAF) estimate of aircraft production in the U.K., Canada and the USA and of the Allied aircraft that have been shot down, on October 7; and a comment from the Chief of the Air Staff (CAS) in response to a query from the Prime Minister (PM), see also 4644; a report on the disruption of Brenner traffic; and a comment by the PM for the CAS; and a report of a U.S. Fortress air raid on Bolzano from the Directory of Intelligence (Operations) (D of I[O]) for the PM via the CAS, on October 9.