News report and video of full speech given to the public by head of MI5.
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Head of MI5 reveals the biggest threats facing the UK
YouTube video by ITV News
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![MI5 chief warns Britain faces greater danger now than on 9/11
In an exclusive op-ed for The Independent on the 25th anniversary of 9/11 , Sir Ken McCallum warns Britain faces the ‘worst of both worlds’ – as Russia and China pose growing threats alongside terrorism
Sam Kiley
Friday 11 Sep 2026 05:00 BST - excerpts:
He [Sir Ken] writes: “This is my call to arms after 25 years: government, business, academia, and the public must treat national security not as the specialist concern of a handful of agencies, but as a shared national endeavour.”
The threat level in the UK is currently at severe, the second-highest category, meaning that an attack is highly likely.
In his rare engagement with the public, Sir Ken uses The Independent to warn that the UK, and the wider West, needs to shun complacency following this success.
He writes: “Contending with rising State-backed aggression – whether sabotage subcontracted to criminals, or covert interference in our democracy, or destructive cyber attacks on power stations – demands new laws as well as new tradecraft.”
Russia has used the full spectrum of attacks that he refers to against the UK in the last 15 years as well as state-sponsored murder.
For Sir Ken, there is no “if” in the planning, or language, or that there will be another “next shock”. It is the when, where, and how to cope that must be planned for. His “call to arms” is for help from across the country.
“In 2026, unlike 2001, many of the assets, systems and services under threat sit in private sector hands. This means many of the most critical decisions will be taken not in COBR but in boardrooms.
“We need a new team of teams, preserving an open economy but cooperating across government, industry and academia, to close vulnerabilities and enable swift coherent action when crises hit.”
https://www.independent.co.uk/news/uk/politics/9-11-anniversary-terrorism-ken-mccallum-mi5-b3047320.html](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:lnk3gn6bofewehhhx6zmj2lg/bafkreibgxy6fkdy4t5h3abfhgvbwazragtjlgg7ww22q2fef2dcj66ckei)
