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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Put your memory and judgement skills to the test in the My MI5sion challenge. Can you crack our three secret tasks?


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Today MI5 is marking International Day for Persons with Disabilities, which aims to increase awareness of disabilities...

The Social Mobility Foundation Index recognises the organisations that are taking the most action to ensure they are...

Fact or Fiction

You can ask whether your relative used to work at MI5