Iran designates Britain’s Royal Navy and RAF as “terrorist organisations” and MI6 as a “hostile group”
Iran’s Foreign Ministry announced on Sunday that it had designated Britain’s MI6 as a “hostile group” and the Royal Navy and Royal Air Force as “terrorist organisations”, in retaliation for what it called a year of hostile British actions.
Iran’s Foreign Ministry announced on Sunday, 1 November 2026, that it had designated Britain’s foreign intelligence service, MI6, as a “hostile group” and the Royal Navy and the Royal Air Force as “terrorist organisations”. The measures took effect on publication of the ministry’s statement, according to the full text carried by Iranian news agencies, and were presented as a direct response to what Tehran described as hostile actions by the British government over the past year.
The announcement contains two separate legal steps. First, MI6 — formally the Secret Intelligence Service — is designated as a “hostile group” under Note 2 of Article 1 of Iran’s law on intensifying penalties for espionage and cooperation with hostile states, with the provisions of that law now applying to the British agency under Iranian law. Second, the Royal Navy and the Royal Air Force are brought under Iran’s countermeasures law, which was framed in response to the United States’ designation of Iran’s Islamic Revolutionary Guard Corps (IRGC) as a terrorist organisation, and are accordingly designated as terrorist organisations under that Iranian legislation.
Tehran gave two main reasons for the move. The ministry said Britain had participated in what it called the US-Israeli war of aggression imposed against Iran, by providing access to military and logistical bases and facilities within British jurisdiction. It also pointed to Britain’s decision on 13 July 2026 to place the IRGC under its State Threats Act 2026, a step the ministry described as part of a pattern of hostile British policy over the past year.
The ministry said the decisions were taken under a resolution of Iran’s Supreme National Security Council and in accordance with the principle of reciprocity. It added that the measures were adopted, in its words, in accordance with international law, and that the British government would bear responsibility for their consequences. The statement framed the action as a measure to safeguard Iran’s security and national interests, rather than as a new military step.
The British designation of the IRGC in July is central to the dispute. Al Jazeera reported that the UK listed the IRGC under a new law allowing foreign state bodies deemed a national security threat to be listed, with anyone who supports or assists the IRGC in the UK facing up to 14 years in prison. Tehran has treated that listing, alongside the earlier American designation, as the legal trigger for its own reciprocal designations of British institutions.
Rudaw, reporting the Iranian statement, added detail on the British role that Tehran is objecting to: Britain initially declined to authorise American strikes from its bases, it said, but subsequently permitted the US military to use RAF Fairford in England and Diego Garcia in the Indian Ocean for operations against Iranian missile facilities. That account has not been presented as a British government statement, and the reports reviewed for this post did not carry an immediate response from London to Sunday’s Iranian announcement.
The designations land in the middle of a wider confrontation that has already reshaped Gulf security. The United States and Israel began a war against Iran at the end of February 2026, and fighting and retaliation have since spilled into shipping through the Strait of Hormuz, attacks on Gulf energy infrastructure and a diplomatic effort, led in part by Qatari mediators, to find a way out. On Sunday, Iran’s foreign minister, Abbas Araghchi, was reported to have reached a plan with Qatari mediators that could fully reopen the Strait of Hormuz within two days if the United States meets Iran’s conditions — a proposal that remains unconfirmed by Washington.
At the same time, Tehran’s military messaging has hardened. On Saturday, Supreme Leader Mojtaba Khamenei ordered Iran’s armed forces to be ready for an “immediate, impactful, and geographically unrestricted” response to any new attack, and directed commanders to update their list of potential targets to include American and Israeli assets of all kinds. On Sunday, the Iranian army’s spokesperson, Brigadier General Mohammad Akraminia, said any new war “will not be confined to the West Asia region” and could prove significantly longer than past conflicts, adding that Iran’s doctrine had been moving from a purely defensive stance towards an offensive approach for some time.
In practical terms, Sunday’s designations are legal and political measures under Iranian law, not a change to the status of the Royal Navy, the Royal Air Force or MI6 under British or international law. Their immediate effect is therefore likely to be diplomatic and rhetorical: they raise the stakes in the public exchange between Tehran and London, give Iranian courts and security bodies a domestic legal basis for treating cooperation with those British institutions as an offence, and signal to third countries that Tehran intends to answer designations of its own institutions in kind.
What happens next will depend in part on London’s response and on whether the parallel diplomatic track makes progress. Britain could answer with its own further listings or sanctions, could treat the move as largely symbolic and leave it unanswered, or could raise it through allies and at the United Nations. A sharper British response would risk deepening the rift at a moment when mediators are trying to reopen Hormuz and avert renewed strikes after the US midterm elections, while a muted response would leave Tehran’s reciprocal-designation precedent standing. Either way, the announcement adds a new, specifically British, front to a war whose diplomatic and military consequences have so far been felt most directly in the Gulf.
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