Terrorism threat levels shift as intelligence changes. This page breaks down what the UK's current levels mean, how they're set, and what businesses should take from them.
Severe: an attack is considered highly likely.
Substantial: an attack is considered likely and is assessed separately.
Threat levels are set by:
For the latest position, check MI5’s terrorism threat level page.
“JTAC continuously reviews the threat as new intelligence and circumstances emerge.” Recent terrorist incidents
The threat level can therefore change at any time when the intelligence picture changes.
What this means for businesses:
Knowing where to look matters as much as knowing the level. Below are the official channels for reporting, training, and practical guidance for staff, security teams, and the public.
Something feels off? Reporting it can stop harm before it happens. Use ACT for non-emergency concerns. Call 999 if there’s immediate danger.
Free training that builds everyday vigilance in staff, spotting suspicious behaviour and knowing what to do about it.
The central hub for counter-terrorism guidance, training, advice and preparedness tools for businesses, venues and the public.
Teaches staff to recognise behaviours worth a second look, using the people and resources already on site.
Free, expert advice on where a building or site’s security has gaps, useful before or alongside a formal review.
Ready-made messaging to help staff and visitors know what to watch for and how to respond.
