- Islamist Extremism (Primary Threat): As of 2023–2024, approximately 75% of MI5’s counter-terror caseload and 80% of live investigations by counter-terrorism police were linked to Islamist threats. This often involves individuals who are self-radicalised online and plan low-sophistication attacks, such as knife or vehicle attacks.
Key Trends:
- Lone Actors: The majority of threats currently come from individuals radicalised online, acting outside of formal terrorist networks, making them difficult to detect.
- Rising Risk Factors: 2025 reports indicate a high number of referrals to the Prevent programme, with a "no ideology" or "violence-fascinated" category increasing rapidly, as well as a significant rise in far-right referrals.
- Youth Involvement: A small but increasing number of minors are being investigated for engaging with terrorism online. [1, 2, 3, 4, 5]
- Counter-Terrorism | MI5 - The Security ServiceTerrorist ideologies * Islamist terrorism. Islamist terrorism is the most significant terrorist threat to the UK by volume. Islami...Security service MI5
- Counter-terrorism strategy (CONTEST) 2023 (accessible) - GOV.UK18 Jul 2023 — Part 1: Terrorism * The impact of terrorism. 10. Since 2018, when CONTEST was last updated, to the publication of this version, ni...GOV.UK