Anthony Blunt, who worked at Buckingham Palace as Surveyor of the Queen’s Pictures, was secretly a Soviet spy during WWII.

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

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

Queen Elizabeth II was not officially informed for almost a decade that one of her most senior courtiers had confessed to ...

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 ...

Despite advances in electronic surveillance, security service MI5 still relies on human ‘watchers’. Government documents ...

Top secret MI5 files detailing first-hand accounts of confessions of three of Britain's most notorious double agents ...

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

Documents newly declassified by MI5, Britain's internal intelligence agency, show the late Queen Elizabeth II was not ...

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

MI5 feared film star Dirk Bogarde could be the target of a KGB gay "entrapment" attempt after it emerged he was on a list of ...

Newly declassified British documents show that Queen Elizabeth II wasn’t told details of her long-time art adviser’s double ...