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

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

MI5’s top interrogator was baffled by Kim Philby, admitting he could not determine whether he was a Soviet spy, according to newly declassified intelligence files. Jim Skardon, a former Metropolitan ...

The documents, on display in the National Archives in Kew, West London, suggest the organisation was keen to dismiss any fantasies about the glamour of espionage.

In one of the newly released files, an MI5 officer notes that Blunt said he felt “profound ... A third, Kim Philby, continued to work for foreign intelligence agency MI6 despite falling under ...

Last year it was revealed that MI5 thwarted 43 late-stage terror attacks on British soil. While many were right-wing or ...

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

As new documents reveal fascinating new details about the infamous MI6 double agent Kim Philby and his betrayals, Mark Hollingsworth reflects on how despite the evidence, he and fellow Soviet agent An ...

Trove of newly declassified files detail investigations into some of the country’s most notorious double agents, the ‘Ring of ...

Security industry guns-for-hire are warned they could face jail time if they work for hostile states — even accidentally.

Guidance for private security industry warns they will be breaking the law if they deliberately work for hostile state actors ...

In one of the newly released files, an MI5 officer notes that Blunt said he ... A third, Kim Philby, continued to work for foreign intelligence agency MI6 despite falling under suspicion.