UK terror threat level reviewed after Iran strikes

UK terror threat level under review after Iran strikes

The UK’s terror threat level is under active review after US and Israeli strikes on Iran and subsequent counterattacks by Tehran, as reported by Sky News (https://news.sky.com/story/uk-terror-threat-absolutely-under-review-after-iran-strikes-defence-secretary-says-13513847). Defence Secretary John Healey said the assessment reflects heightened regional tensions and potential knock-on risks for UK interests.

Officials have emphasized elevated vigilance domestically and stronger protection of British forces overseas. Any formal update would typically engage MI5’s assessment and a Home Office announcement.

Why it’s under review: Iranian retaliation and proxies risk

The review is driven by concerns about Iranian retaliation and the potential for aligned proxies to act beyond the region. The UK Government’s response to the Intelligence and Security Committee in July 2025 identified Iran as a core security priority and cited 20 Iran-backed plots against UK persons or interests since 2022 (https://www.gov.uk/government/publications/government-response-to-the-intelligence-and-security-committee-of-parliament-report-iran/government-response-to-the-intelligence-and-security-committee-of-parliament-report-iran). That history underpins the present caution around Tehran’s reach and methods.

MI5’s Director General, Ken McCallum, has previously warned that Iranian state actors use proxy and criminal networks to target dissidents and that the risk has been escalating, as reported by the Guardian (https://www.theguardian.com/uk-news/2024/oct/08/mi5-chief-uk-facing-growing-threat-from-islamic-state-russia-and-iran). In a broadcast interview, the Defence Secretary framed the current stance plainly: “The terror threat level is absolutely under review,” said John Healey, Defence Secretary.

What a change would mean for the public and agencies

A change in the national threat level would guide how agencies calibrate resources and public communications. It would codify the elevated posture already signalled and shape protective security activity across government and policing.

Domestically, that could mean more visible security at sensitive locations and clearer advisories, though authorities have not outlined specific measures. Ministers have also pointed to the highest protective posture for British forces overseas and high alert at home, as reported by Birmingham Mail (https://www.birminghammail.co.uk/news/world-news/uk-terror-threat-absolutely-under-33512220).

Who sets and announces UK threat levels: MI5 and Home Office

Assessments of terrorist threat originate within MI5, while formal announcements are made by the Home Office, according to the Home Office. The Defence Secretary indicated that any change to the national level would be announced by the Home Secretary in line with that process.