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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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

There is an underground tunnel linking MI5 and SIS
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