One Intelligence Service, Two Histories

"Two histories of the early decades of MI-6, the United Kingdom’s foreign intelligence service, have recently been published. “MI6: The History of the Secret Intelligence Service 1909-1949″ by Keith Jeffery is the authorized version, prepared with the cooperation of the Service. “Six: A History of Britain’s Secret Intelligence Service” by Michael Smith is the unauthorized version."

Thank you, Secrecy News: The History of MI-6, Authorized and Unauthorized