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: Mr Loxley's summary (see 6630); and T199/21, on Western Europe: that the Commander in Chief (C-in-C) West reported on May 25 that in view of probable transport delays, anti-gas equipment was to be stored near units, and the report went on to refer to the delivery of gas ammunition.