The newly-declassified documents include details about some of the UK's most notorious spies.

A World War II-era tailing guide is among declassified records shedding light on spy game in MI5: Official Secrets, at the National Archives.

Rookie wartime MI5 "watchers" were advised they needed to be prepared to offer a big tip if they had to tell a taxi driver to "follow that cab" when pursuing a suspect, newly declassified documents reveal.

Despite advances in electronic surveillance, security service MI5 still relies on human ‘watchers’. Government documents reveal what it takes to follow suspects without being detected.

MI5 reveals confessions of three members of infamous Cambridge Five spy ring as tranche of documents released into National Archives

Recently released MI5 files reveal confessions from Britain's notorious double agents, including Kim Philby and Anthony Blunt, who spied for the Soviets. These declassified documents, made public by the National Archives,

The guidance will feature in a new exhibition at the National Archives focusing on the work of the Security Service.

Queen Elizabeth II wasn’t told details of her long-time art adviser's double life as a Soviet spy because palace officials didn’t want to add to her worries, newly declassified documents reveal.

Five Cambridge University graduates served as double agents, leaking highly classified information to the Soviet Union

Well-acted and tight, maybe to a fault, the docudrama “September 5” revisits the 1972 Olympics massacre in Munich in which 11 members of the Israeli Olympic team died, along with five members of

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