Iran declares Britain's Royal Navy and RAF 'terrorist organisations' and labels MI6 a hostile group in reply to UK action on the IRGC
Iran listed the Royal Navy and RAF as terrorist groups and MI6 as hostile from November 1, answering Britain's July move against the Revolutionary Guards.
At a glance
- Iran's foreign ministry said the Royal Navy and Royal Air Force are now listed as terrorist organisations and MI6 as a hostile group, effective November 1.
- Tehran calls it reciprocity for Britain's July designation of the Revolutionary Guards under the State Threats Act 2026.
- Iran also accuses Britain of aiding the US-Israeli war by giving access to bases under its jurisdiction.
- Tehran has not said how the listing will be enforced, and no British response had been published when this report was filed.
Iran has declared Britain's Royal Navy and Royal Air Force terrorist organisations and classed MI6, the UK's foreign intelligence service, as a hostile group. The foreign ministry announced the measures on Sunday, November 1, and said they take effect the same day. Tehran described the step as direct retaliation for Britain's action against the Islamic Revolutionary Guard Corps in July.
The ministry said the decision rests on a resolution of Iran's Supreme National Security Council and follows "the principle of reciprocity". It added that the British government would bear responsibility for the consequences. No British response had been published when this report was filed.
Three British bodies, two Iranian laws
The labels are not identical, and they rely on different legislation.
| Body | Iranian label | Legal basis cited |
|---|---|---|
| Royal Navy | Terrorist organisation | Law passed to counter the US designation of the Revolutionary Guards |
| Royal Air Force | Terrorist organisation | Same law |
| MI6 | Hostile group | Espionage law banning cooperation with Israel and other states Tehran classes as hostile |
Iran has used the same tool before. In 2019 it declared the US military's Central Command a terrorist organisation within days of Washington blacklisting the Guards, and the law cited on Sunday grew out of that dispute. Britain is now on the receiving end of a similar answer, at a moment when its forces are operating in the region.
What Britain did in July
The UK designated the Revolutionary Guards on July 13 under the State Threats Act 2026, treating the force as a threat to national security. Home Secretary Shabana Mahmood said that support for the Guards, from voicing a positive opinion to giving practical help, would become an offence carrying up to 14 years in prison.
Iran's ministry called that decision malicious. It also accuses Britain of taking part in the US-Israeli war by giving access to military and logistics bases under British jurisdiction. London has presented its role in the region as defensive. At the Manama Dialogue in Bahrain this weekend, UK Middle East Minister Stephen Doughty said Britain has deployed air defence equipment and personnel to Saudi Arabia.
How the listing could matter on the water
Tehran has not said how it will enforce the measure, and the practical answer is what matters most. A listing does not by itself change the rules of engagement for any ship or aircraft. It does give Iran a domestic legal label for British forces, and it comes during the worst month yet for attacks on merchant shipping around the Strait of Hormuz.
The timing also adds to a tense week in the wider war:
- Supreme Leader's order: Mojtaba Khamenei has told commanders to prepare a response with no geographic limit to any new US or Israeli attack, and to widen the list of targets.
- Shipping: three vessels were hit in the Gulf in two days, including the Qatari LNG carrier Al Mayeda.
- Diplomacy: Foreign Minister Abbas Araghchi says a plan to reopen Hormuz within two days is under discussion with Qatar, on conditions the US has not accepted.
- US decision: Reports citing Gulf officials say strikes could come as early as November 4. Secretary of State Marco Rubio says President Donald Trump has not decided.
Who could feel it first
The most immediate exposure may fall on individuals rather than warships. Under the espionage law, contact with MI6 can be treated as a security crime in Iran, and Iranian authorities have in the past prosecuted dual nationals and foreigners on spying charges. Iran has not announced any case linked to this decision. Britons and British-Iranians with ties to Iran should follow the UK government's travel advice directly.
The move could also weigh on what contact remains between London and Tehran. Iran gave no sign of ending diplomatic relations on Sunday, and it did not announce any step against British diplomats or companies.
What to watch from London
The first test is Britain's reply, likely from the Foreign Office or the Ministry of Defence. Beyond that, Parliament's return to questions on Iran and any incident involving British ships or aircraft in the Gulf would show whether Sunday's listing stays on paper. In the wider conflict, the next fixed date is the US vote on November 3.
Questions people are asking
Why did Iran label the Royal Navy and RAF terrorist organisations?
Iran says it is responding to Britain's July 2026 action against the Revolutionary Guards and to British bases and logistics being used in the US-Israeli war against it.
What does Iran's designation of MI6 mean?
MI6 falls under an Iranian espionage law that bans cooperation with Israel and other states Tehran classes as hostile. Dealing with the agency could therefore expose people inside Iran to prosecution under that law.
