Introduction to the Security Service

MI5's mission is to keep the country safe. For more than a century we have worked to protect the UK from a range of threats, whether it be from terrorism or hostile activity by states.

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Director General Ken McCallum writes in The Times about nature of the threats facing the UK and the reasons to share...

Poppies

Staff at MI5 have today joined people around the UK to remember the sacrifice of those who lost their lives protecting...

Fact or Fiction

All MI5 officers are based in London
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