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 Director of Naval Intelligence (DNI), a report for the First Sea Lord (1SL) to see; and a report on Kesselring's dispositions in expectation of a heavy Allied attack on Cassino, on January 18, noting the need to reinforce the Rome area.