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

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 ...

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

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

The files about royal art historian Anthony Blunt are among a trove from the intelligence agency MI5 released Tuesday by ...

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

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 ...

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

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

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 ...

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

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