Introduction

“MI5 investigates threats to national security through the gathering of secret intelligence and by working closely with other organisations and government departments. We do this within a strict framework of legislation and oversight to ensure our investigative powers are only used where it is necessary and proportionate to do so.”

Latest News

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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

There is an underground tunnel linking MI5 and SIS
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