The definitive visual record of the clandestine work carried out by the British Security Service, MI5.Regnum Defende: Defend the Realm. MI5, the intelligence agency responsible for protecting the UK against threats to national security, has acted under this motto since it was founded in 1909. This has involved the management of secrets over the decades: secrets for which vast swathes of information are now declassified. Detailing uprisings and executions, double agents, and f...
