Introduction to the Security Service

MI5's mission is to keep the country safe. For more than a century we have worked to protect our people from danger whether it be from terrorism or damaging espionage by hostile states.

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Are you up to the challenge?

The My MI5sion challenge will put your memory and judgement skills to the test. Can you crack our 3 secret missions and pass the test?


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We are saddened to announce that Sir Patrick Walker, Director General of MI5 between 1988-1992, died on 13 October...

October is Black History Month - an annual celebration of the history and contributions of Black people in the UK. MI5...

Fact or Fiction

You can ask whether your relative used to work at MI5