Some MI5 material relating to its involvement with a teenager who was charged with terrorism before taking her own life is ...

Widening the definition of terrorism could overwhelm the police and MI5, the lawyer carrying out a review of the definition ...

Newly declassified British documents show that 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 ...

A defendant in an alleged Russian spy ring case told police he had already spoken to MI5 when he was arrested, the Old Bailey ...

Queen Elizabeth II was not officially informed for almost a decade that one of her most senior courtiers had confessed to being a Soviet spy, according to newly released MI5 files. Art historian ...

A World War II-era guide to tailing a target, and files on notorious double agents such as Kim Philby, feature in MI5: ...

Avoid facial disguises, carry loose change and be ready to make split-second decisions: just some of the advice Britain’s ...

Do not use false beards, carry plenty of spare change for the tube, and if you have to tell a taxi driver to “follow that cab”, be prepared to give him a big tip. That was the advice issued to rookie ...

A closer look at recently declassified MI5 files on the intelligence failure surrounding the five "Cambrdige spies" ...

Newly released MI5 files from the National Archives reveal that British intelligence monitored potential connections between ...

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Newly released MI5 files reveal that, for nearly 10 years, the late monarch didn’t know that royal household member Anthony Blunt was actually a Soviet double agent. According to the BBC ...