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

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 ...

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 ...

Jonathan Hall KC warned that football hooligans and criminal gangs could technically be classed as terrorists under Sir ...

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

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

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

In the meantime, here's everything we know about Slow Horses series 1-6 so far... What is Slow Horses about? We've already ...

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The PSNI has refused to say if MI5 officers were involved in a stop and search of republican mourners returning from the wake ...