Newly released MI5 papers have added fresh speculation that second generation Irishman ‘Paddy’ Costello, the son of a Dublin grocer, could have been The Sixth Man in the infamous Cambridge Spy Ring. Writer/researcher Johanna Lowry-O’Reilly looks at the evidence as to whether he was an Irish nightingale or a carrier pigeon?

Espionage at the very heart of the government has always occurred. Johanna Lowry-O’Reilly looks at some of the more famous cases in the United Kingdom.

The infamous spies who infiltrated Britain in the 1950s and ‘60s came from the wealthy upper classes and went unchallenged in their roles, writes Neil Robinson.

George Blake, the former British spy who was a double agent working for the Soviet KGB, has spoken about his career with pride and called himself an “exceptionally lucky man”.

Christine Keeler, the woman at the centre of the Profumo scandal, claims she was made pregnant by the then Secretary of State for War.