UK Faces Rising Iranian Threat: Espionage, Assassinations, and Cyberattacks at Russian Levels, Says Security Report

A landmark Parliamentary Intelligence and Security Committee (ISC) report has declared Iran’s threat to the United Kingdom as being on par with Russia, warning that Tehran is increasingly targeting the UK with cyberattacks, physical intimidation, and assassination plots.

The report portrays the Islamic Republic as a pragmatic but dangerous regime bent on survival, and heavily reliant on asymmetric warfare, espionage, and proxy violence—both across the Middle East and on British soil.

Espionage and Assassination: UK Now a Top Iranian Target

Iranian Dissidents in Britain Living Under Siege

The committee’s most urgent concern centers on the threat to Iranian dissidents residing in the UK, particularly those working with Persian-language media outlets critical of the regime. Many of these journalists and activists have faced intimidation, surveillance, and, in several cases, credible threats of assassination.

While the ISC’s report concluded its evidence-gathering phase in August 2023—prior to the May 2025 arrests of five Iranian nationals suspected of plotting terrorism—it notes a rapid escalation in threats after the death of Mahsa Amini in Iranian custody in 2022, which triggered nationwide protests and increased global scrutiny of the regime.

Tehran’s Cyber Offensive Targets UK Infrastructure

State-Linked Hackers Exploit Gaps in UK Cyber Defenses

According to the ISC, the UK ranks just below the United States and Saudi Arabia as a priority target for Iranian cyber-espionage. These operations often involve a mix of state-sponsored hackers and private actors operating for personal or ideological gain.

Key UK sectors under threat include:

Petrochemical and energy infrastructure
Financial services
Media and telecommunications

The report warns that Tehran’s hybrid cyber-operations represent a critical vulnerability in national security—particularly given the UK’s lagging defensive posture in cyberspace.

UK Security Response: Too Little, Too Fragmented

‘Firefighting’ Strategy Slows Long-Term Planning

The ISC report is damning in its assessment of Whitehall’s Iran policy, describing it as reactive and overly focused on nuclear non-proliferation, to the detriment of broader intelligence and security priorities.

“Firefighting has prevented the government from carrying out longer-term thinking,” said Lord Beamish, ISC chair.

The committee criticized:

Over-bureaucratic decision-making
Poor interdepartmental coordination
A lack of Persian language skills and regional expertise in key agencies

One senior witness bluntly remarked:

“If you have people running policy in the Foreign Office who don’t speak a word of Persian, then that is a fat lot of good, to be honest.”

Legal Paralysis Over IRGC Proscription

Fear of Diplomatic Fallout Blocks Key Designation

Despite growing evidence of Iranian plots, the UK government remains paralyzed over whether to formally proscribe the Islamic Revolutionary Guard Corps (IRGC) as a terrorist entity.

The report explains that proscription could mean arrest and prosecution of individuals merely for membership—including up to a quarter of Iran’s cabinet—a legal minefield that has so far deterred government action.

Meanwhile, other jurisdictions, including the United States, have moved forward with full IRGC bans. Critics argue that the UK’s hesitation undermines deterrence and fails to adequately protect dissidents and citizens.

New Laws Target State-Sponsored Terrorism

Foreign Influence Registration Scheme Enacted

In March, Security Minister Dan Jarvis announced sweeping new reforms targeting foreign-directed activity in the UK, placing Iran as a whole—its state, IRGC, and intelligence services—on an enhanced tier of the UK’s new Foreign Influence Registration Scheme.

Under this law, any individuals or entities operating on behalf of the Iranian regime must register their activities—or face up to five years in prison.

The move was paired with a broader inquiry led by Jonathan Hall KC, tasked with examining state-sponsored terrorism mechanisms, including covert political interference and funding of criminal proxies.

MI5 and Home Office Sound the Alarm

Over 20 Iran-Linked Plots Disrupted Since 2022

In a rare disclosure, MI5 Director General Ken McCallum recently revealed that UK security services have thwarted 20 Iran-backed plots since early 2022. These include attempts to abduct or kill Iranian nationals living in Britain.

Home Secretary Dan Jarvis echoed these concerns, stating:

“It is no secret that there is a longstanding pattern of targeting Jewish and Israeli people internationally by Iranian intelligence services… It is clear that these plots are a conscious strategy of the Iranian regime to stifle criticism through intimidation and fear.”

Iran’s Strategic Doctrine: Survival by Proxy

Avoiding War, Spreading Influence

According to the ISC report, Iran’s broader strategy is less about ideology and more about regime survival. Tehran has long favored proxy warfare, building a sophisticated network of allied groups like:

Hezbollah in Lebanon
Houthis in Yemen
Shiite militias in Iraq and Syria

These proxies serve as force multipliers, allowing Iran to exert influence without engaging in direct military confrontation.

What This Means for UK Businesses and Institutions

Prepare for Escalation in Hybrid Threats

CEOs, CISOs, and public-sector leaders should treat this report as a wake-up call. Iran’s threat matrix is no longer theoretical—it’s active, growing, and increasingly targeting the UK.

Key takeaways:

Cyber defenses must be hardened—especially in critical infrastructure and finance.
Personnel risk assessments are needed for employees of Persian media, NGOs, and cultural organizations.
Foreign influence disclosures must be tightened—especially among lobbyists, consultants, and academia.
Corporate crisis planning should now include state-sponsored threats, particularly from Iranian actors.
Cross-sector coordination with government agencies will be crucial to identifying and mitigating hybrid threats.

The UK Can’t Afford to Sleepwalk Through Another Threat

Iran is no longer a fringe menace. It is now officially in the top tier of threats to UK national security—alongside Russia. For too long, British policy has focused narrowly on nuclear containment while ignoring covert influence operations and targeted violence happening on its own streets.

The ISC’s report is a clear call to shift from crisis response to proactive defense. Whether through legal reform, cyber resilience, or intelligence cooperation, the time to act is now.