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

The National Archives has released declassified MI5 files, including the confession of a civil servant who worked in the ...

Queen Elizabeth II was not officially informed for nearly a decade that Anthony Blunt was a Soviet spy, newly declassified documents reveal.

Top secret MI5 files detailing first-hand accounts of confessions of three of Britain's most notorious double agents including Kim Philby and Anthony Blunt who spied for the Soviet Union were released ...

Britain’s National Archives on Tuesdayreleased declassified MI5 domestic counterintelligence agency files containing the confessions of notorious double agents known as the “Cambridge Five” who spied ...

The Cambridge Five consisted of Harold ‘Kim’ Philby, Guy Burgess, Donald Maclean, Anthony Blunt and John Cairncross, who together made up the most infamous spy ring of the 20th century.

Several other people have been suggested as belonging to the ring, including John Cairncross ... the British government discovered he was a spy but offered him immunity in return for information.

Mr Philby and Mr Blunt were, along with Mr Guy Burgess, Mr Donald Maclean and Mr John Cairncross ... without surprise," it said. Mr Cairncross, the last of the spy ring to be publicly identified ...

Philby and Blunt were, along with Guy Burgess, Donald Maclean and John Cairncross, part of the "Ring of ... "She took it all very calmly and without surprise," it said. Cairncross, the last of the spy ...