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 Yugoslavia: a minute from C to the Prime Minister (PM) concerning a request from the PM to Sir O Sargent to discuss with him a recent Japanese Foreign Office telegram about Mihajlovic; C attaches a summary of all recent sigint reports on the subject for the PM: the summary contains items on Mihajlovic's Chetniks; on the Axis occupation of the bauxite mines' area; on partisans; and on contacts between Mihajlovic and the Germans and Italians.