A file of correspondence and memoranda relating to the coordination of the British intelligence services, with a particular focus on coordination in the United States of America. Topics of discussion in this file include a proposal for a monthly coordination meeting of representatives of all the intelligence branches; a review of British intelligence representation in the USA, and ensuing reforms; problems deciphering enciphered telegrams; cooperation and relations between British and Canadian intelligence; bad feeling between British intelligence and the American Federal Bureau of Investigation (FBI); and representation of the Security Service (MI5) in the USA.