MI5

For decades the Security Service did not officially exist. Now it posts on Instagram. But what is MI5? How has it transformed itself since the second world war? And what kind of people work there? Ros Taylor speaks to former Guardian security editor Richard Norton-Taylor and a former legal director of MI5, David Bickford.

Richard Norton-Taylor is the former security editor of the Guardian and the author of several books including The State of Secrecy: Spies and the Media in Britain, and David Bickford, a former legal director of MI5 and MI6 and thriller author – you can get his latest, Cold Protocol, for £5 using the code on his website.

The standard history of MI5 is The Defence of the Realm: The Authorised History of MI5 by Christopher Andrew, which is very long and currently available cheaply on Kindle. Not everyone rated it. Stella Rimington published her autobiography Open Secret, and Eliza Manningham-Buller wrote Securing Freedom.

I also drew on an article by H Dylan, The Intelligence Lobby Before the Intelligence Lobby: MI5 Director General Stella Rimington and the Hunt for the New Legitimacy, Rimington's 1994 Richard Dimbleby lecture and MI5 director Ken McCallum's 2025 threat update, 

The account of Anthony Blunt's confession can be found at the National Archives, as can the booklet on Observation.

Margaret Thatcher's Commons statement about Blunt, Tony Blair's response to the 7/7 bombings and footage of the Bishopsgate IRA bombing are available online.

The Imperial War Museum North's exhibition on spies is on until August.

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