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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Five Eyes conference at Stanford University

The heads of the Five Eyes domestic intelligence agencies today launched new advice to help organisations protect...

MI5 Director General Ken McCallum has welcomed the National Security Act receiving royal assent.

Fact or Fiction

All MI5 officers are based in London
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