Post-Cold War Relations normalized in 1997 during President
Mohammad Khatami's reformist administration, with
Jack Straw becoming the first high-ranking British politician to visit Tehran in 2001 since the revolution. A setback occurred in 2002 when
David Reddaway was rejected by Tehran as London's ambassador, on charges of being a spy. In February 2004, following
the earthquake in Bam,
Prince Charles met President
Mohammad Khatami in Tehran before travelling to Bam.
2004 Iranian seizure of Royal Navy personnel On 21 June 2004, eight sailors and Royal Marines were seized by forces of the Revolutionary Guards' Navy while training Iraqi river patrol personnel in the
Persian Gulf. The sailors were pardoned and attended a goodbye ceremony with President
Ahmadinejad shortly after they were released.
Political tension British exports to Iran increased during the first years of the 21st century. A
UK Trade & Investment press officer said Iran had become more attractive as it pursued a more liberal economic policy. The Telegraph cited "a senior Foreign Office source" saying that "The belief in some areas of Whitehall is that an attack is now all but inevitable. There will be no invasion of Iran but the nuclear sites will be destroyed." The
BBC reported a denial that the meeting would take place, but no denial of the alleged themes of the meeting, by the UK Ministry of Defence, and that "there is well sourced and persistent speculation that American covert activities aimed at Iran are already underway".
Gholhak Garden In 2006 a dispute about the ownership of
Gholhak Garden, a large British diplomatic compound in northern Tehran was raised in the Iranian Parliament when 162 MPs wrote to the speaker. The British Embassy have occupied the site since at least 1934 and assert that they have legal ownership but the issue was raised again in 2007 when a group of MPs claimed that the ownership papers for the site were unlawful under the laws extant in 1934. As of October 2011, it is still British.
2007 Iranian arrest of Royal Navy personnel On 23 March 2007 fifteen Royal Navy personnel were
seized by the naval forces of the Iranian Revolutionary Guard for allegedly having strayed into Iranian waters. Eight sailors and seven Royal Marines on two boats from HMS
Cornwall were detained at 10:30 local time by six Guard boats of the IRGC Navy. They were subsequently taken to Tehran. Iran reported that the sailors are well. About 200 students targeted the British Embassy on 1 April 2007 calling for the expulsion of the country's ambassador because of the standoff over Iran's capture of 15 British sailors and marines. The protesters chanted "Death to Britain" and "
Death to America". Speculation on the Iranians' motivations for this action ran rampant; with the Iranians under tremendous pressure on a number of fronts from the United States, the
Revolutionary Guard Corps could have been responding to any one of a number of perceived threats. On 3 April 2007,
Prime Minister Tony Blair advised that "the next 48 hours will be critical" in defusing the crisis. At approximately 1:20 PM GMT, Iran's president announced that the 8 sailors would be 'pardoned'. The following day, he announced all 15 British personnel would be released immediately "in celebration of the Prophet's birthday and Easter."
2007 Nuclear policy disagreements On March 18, 2007,
Iran, under fire from Western powers over its atomic program, criticized Britain's plans to renew its nuclear arsenal as a "serious setback" to international
disarmament efforts. Britain's parliament backed Prime Minister
Tony Blair's plans to renew the country's
Trident missile nuclear weapons system. "Britain does not have the right to question others when they're not complying with their obligations" referring to the obligation by the
U.K., United States, Russia and France to
disarm under the NPT accord and "It is very unfortunate that the UK, which is always calling for non-proliferation not only has not given up the weapons but has taken a serious step toward further development of
nuclear weapons," Iran's envoy to the
International Atomic Energy Agency, told a conference examining the Trident decision.
Asylum On 14 March 2008, Britain said it would reconsider the
asylum application of
Mehdi Kazemi, a
gay Iranian teenager who claimed he would be persecuted if he was returned home. He had fled to the
Netherlands and sought asylum there; however, the Dutch government turned him down, saying the case should be dealt with in Britain, where he first applied. He was granted
asylum by Britain in 2008.
Arms sales Despite the political pressure and sanctions, a probe by customs officers suggests that at least seven
British arms dealers have been supplying the Iranian air force, its elite Revolutionary Guard Corps, and the country's controversial nuclear ambitions. A UK businessman was caught smuggling components for use in guided missiles through a front company that proved to be the Iranian Ministry of Defence. Another case involves a group that included several Britons which, investigators alleged, attempted to export components intended to enhance the performance of Iranian aircraft. Other examples involve a British millionaire arms dealer caught trading machine-guns used by the
SAS and capable of firing 800 rounds a minute with a Tehran-based weapons supplier. In mid-2008, amid speculation about possible U.S.–Israeli strikes on Iran, an Iranian Foreign Ministry official, Wahid Karimi, was quoted as suggesting that targeting London could deter an attack; no such incident occurred.
2009 Iranian election controversy In the aftermath of the disputed
2009 Iranian presidential election and the
protests that followed, UK-Iran relations were further tested. On 19 June 2009, the
Supreme Leader of Iran Ali Khamenei described the
British Government as the "most evil" of those in the Western nations, accusing the British government of sending spies into Iran to stir emotions at the time of the elections, although it has been suggested by British diplomats that the statement was using the UK as a "
proxy" for the United States, in order to prevent damaging
US–Iranian relations. Nonetheless, the British Government, unhappy at the statement, summoned the Iranian
ambassador Rasul Movaheddian to the
Foreign Office to lodge a protest. Iran then proceeded to
expel two British
diplomats from the country, accusing them of "activities inconsistent with their diplomatic status". On 23 June 2009, the British Government responded, expelling two Iranian diplomats from the United Kingdom.
Prime Minister Gordon Brown stated that he was unhappy at having to take the action, but suggested there was no option after what he described as 'unjustified' actions by Iran. Four days later, Iranian authorities arrested several local British embassy employees in Tehran, alleging their "considerable role" in the recent unrest. The UK demanded their immediate release, calling the accusations baseless, and the
EU warned of a “strong response” under international law if they were not freed. UK foreign secretary
David Miliband praised the bravery of Iranians who took part in the opposition demonstrations; in response, Iran summoned the British ambassador to lodge a formal protest. Most of the detained employees were freed within days; the last one was released after a bail had been paid.
Queen's College, Oxford created the
Neda Agha-Soltan Graduate Scholarship in 2009, named after
Neda Agha-Soltan, who died in the protests after the election. Iran's embassy in London, in a letter signed by deputy ambassador Safarali Eslamian, disputed the circumstances of her death and accused the college of politicising the case and echoing alleged British interference. According to
The Times, UK diplomatic sources said the award further strained relations with Iran; officials would have advised against it as provocative and unhelpful to efforts to secure the release of detained local embassy staff in Tehran. The college said the scholarship was not a political act and that refusing the initial donations would also have been a political decision. The money is compensation for an arms deal dating from the 1970s which then did not come about due to the occurrence of the
Iranian Revolution. The Shah's government had ordered 1,500
Chieftain tanks and 250 Chieftain
armoured recovery vehicles (ARVs) in a contract worth £650 million, but only 185 vehicles had been delivered before the revolution occurred. The contract also covered the provision of training to the Iranian army and the construction of a factory near
Isfahan to build tank parts and ammunition.
2011 attack on the British Embassy On 28 November 2011, in response to joint U.S., UK, and Canadian sanctions, Iran downgraded relations with the United Kingdom, expelling the British ambassador. The next day, despite heavy police resistance, protesters, including students and
Basiji, stormed two compounds of the
British embassy in Tehran, smashing windows, ransacking offices, burning documents and a British flag, and forcing staff to flee. On 30 November 2011, in response to the attack, the UK closed its embassy in Tehran and ordered the Iranian embassy in London closed.
Foreign secretary William Hague announced that all Iranian diplomats were
expelled within 48 hours. The
British Foreign Office called the attack "utterly unacceptable." From July 2012 until October 2013, British interests in
Iran were maintained by the Swedish embassy in
Tehran while
Iranian interests in the
United Kingdom were maintained by the Omani embassy in
London.
Since 2011 The UK defence secretary
Philip Hammond warned that Britain might take military action against Iran if it carries out its threat to block the
Strait of Hormuz. He said any attempt by Iran to block the strategically important waterway in retaliation for sanctions against its oil exports would be "illegal and unsuccessful" and the
Royal Navy would join any action to keep it open. British defence officials met
US Secretary of Defense Leon Panetta on 6 January to criticize other members of the
NATO for not being willing to commit resources to joint operations, including in
Libya and
Afghanistan. The following day, UK officials reported its intention to send its most powerful naval forces to the
Persian Gulf to counter any Iranian attempt to close the
Strait of Hormuz. The
Type 45 destroyer would arrive in the Gulf by the end of January. According to officials, the ship is capable of shooting down "any missile in Iran's armoury." with UK foreign secretary
Boris Johnson, 9 December 2017 In July 2013, the UK considered opening better relations with Iran "step-by-step" following the
election of President
Hassan Rouhani, and in October of the same year, both countries announced that they would each appoint a
chargé d'affaires to work toward resuming full diplomatic relations. This was done on 20 February 2014, and the British government announced in June 2014 that it would soon re-open its Tehran embassy. Embassies in each other's countries were simultaneously reopened in 2015. The ceremony in Tehran was attended by UK foreign secretary
Philip Hammond, the first British foreign secretary to visit Iran since Jack Straw in 2003, who attended the reopening of the Iranian embassy in London, along with Iran's deputy foreign minister Mehdi Danesh Yazdi. Diplomat Ajay Sharma was named as the UK's charge d'affaires but a full ambassador was expected to be appointed in the coming months. In September 2016, both countries restored diplomatic relations to their pre-2011 level, with
Nicholas Hopton being appointed British ambassador in Tehran. According to a 2013
BBC World Service poll, only 5% of British people view Iran's influence positively, with 84% expressing a negative view. According to a 2012 Pew Global Attitudes Survey, 16% of British people viewed Iran favorably, compared to 68% which viewed it unfavorably; 91% of British people oppose Iranian acquisition of
nuclear weapons and 79% approve of "tougher sanctions" on Iran, while 51% of British people support use of military force to prevent Iran from developing nuclear weapons. On February 20, 2014, the
Iranian Embassy in London was restored and the two countries agreed to restart diplomatic relations. On August 23, 2015, the
British Embassy in Tehran officially reopened. British prime minister
David Cameron and Iranian president
Hassan Rouhani met on the sidelines of a
United Nations in September 2014, marking the highest-level direct contact between the two countries since the 1979 Islamic revolution. The UK defence journal reported that in 2014, before
Scotland’s independence referendum, Iran linked social media accounts spread memes and cartoons of
UK prime minister David Cameron to promote a view of
England being authoritarian. Iranian facebook pages “mimicked” Scottish media and thus were able to gain momentum. She was found guilty of "plotting to topple the Iranian government" in September 2016 and sentenced to 5 years in prison. Her case has been described by rights groups and lawmakers as an instance of
state hostage-taking. After her initial sentence expired in March 2021 she was charged and found guilty of propaganda activities against the government and sentenced to one year in prison. She was finally released on 16 March 2022, which was reported to be related to the UK paying a historic debt for tanks paid for by Iran in the 1970s but never delivered.
Theresa May, who succeeded Cameron as prime minister in July 2016, accused Iran of "aggressive regional actions" in the Middle East, including stirring trouble in Iraq, Lebanon and Syria, and this led to a deterioration in relations. In response, Iran's Supreme Leader
Ali Khamenei condemned Britain as a "source of evil and misery" for the Middle East. The British intelligence officials concluded that Iran was responsible for a
cyberattack on the
British Parliament lasting 12 hours that compromised around 90 email accounts of
MPs in June 2017.
Tanker detention and Strait of Hormuz tensions On 4 July 2019,
Royal Marines boarded the Iranian-owned tanker
Grace 1 by helicopter off
Gibraltar where it was detained. The reason given was to enforce
European Union sanctions against
Syrian entities, as the tanker was suspected of heading to
Baniyas Refinery named in the sanctions that concern Syrian oil exports. Spain's foreign minister
Josep Borrell stated that the detention was carried out at the request of the United States. An Iranian Foreign Ministry official called the seizure "piracy," stating that the UK does not have the right to implement sanctions against other nations "in an extraterritorial manner". On 10 July 2019, tensions were raised further when boats belonging to Iran's
Islamic Revolutionary Guard Corps approached a
British Petroleum tanker,
British Heritage, impeding it while it was transiting the
Strait of Hormuz. The Royal Navy frigate positioned themselves between the boats and ship so that it could continue its journey. On 14 July 2019, British foreign secretary
Jeremy Hunt said
Grace 1 could be released if the UK received guarantees the oil — 2.1 million barrels worth — would not go to Syria. soldiers On 19 July 2019, Iran media reported that the Swedish owned but British-flagged oil tanker
Stena Impero had been seized by the Iranian Revolutionary Guard in the Strait of Hormuz. A first tanker, MV
Mesdar, which was a
Liberian-flagged vessel managed in the UK, jointly Algerian and Japanese owned, was boarded but later released. Iran stated that the British-flagged ship had collided with and damaged an Iranian vessel, and had ignored warnings by Iranian authorities. During the incident HMS
Montrose was stationed too far away to offer timely assistance; when the
Type 23 frigate arrived it was ten minutes too late. HMS
Montrose was slated to be replaced by , however in light of events it was decided that both ships would subsequently be deployed together. On 15 August 2019 Gibraltar released
Grace 1 after stating that it had received assurances she would not go to Syria. The Iranian government later stated that it had issued no assurances that the oil would not be delivered to Syria and reasserted its intention to continue supplying oil to the Arab nation. On 26 August, Iranian government spokesman Ali Rabiei announced that the 2.1 million barrels of crude had been sold to an unnamed buyer, in either
Kalamata, Greece or
Mersin, Turkey. A US court issued a warrant of seizure against the tanker because it was convinced that the tanker was owned by the
IRGC, which is deemed by Washington a
foreign terrorist organization. On 15 August 2019 the UK's new
Boris Johnson-led government agreed to join the U.S. in its
Persian Gulf maritime security Operation Sentinel, abandoning the idea of a European-led naval protection force. On 4 September 2019 Iran released seven of the 23 crew members of the British-flagged oil tanker
Stena Impero, which the Iranian forces had detained in August. The Iranian Foreign Ministry spokesman Abbas Mousavi stated that they have been released on humanitarian grounds. He said that their problem was the violation committed by the ship. On 23 September, the Iranian authorities announced that the British-flagged tanker Stena Impero, which they had captured on July 19 in the
Strait of Hormuz, was free to leave. According to the government spokesperson
Ali Rabiei informed that the legal process concluded and all the conditions to let the oil tanker go were also fulfilled. However, on September 24, it was reported that despite raising a green signal for the British tanker to leave the port, it remained in Iran waters. Swedish owner of Stena Impero, Erik Hanell said that they had no idea why the tanker was still there. On 27 September, the Stena Impero departed from Iranian waters and made its way to Port Rashid in Dubai. All of the remaining crew members who were still detained by Iran were released as well. The ship was also able to transmit location signals before arriving at Port Rashid, Dubai, In March 2022, the UK settled a £400 million debt to Iran, in order to secure the release of dual British-Iranian Nationals of
Nazanin Zaghari-Ratcliffe and
Anoosheh Ashoori. On 14 January 2023, Iran executed dual British-Iranian
Alireza Akbari. In the wake of the release of Zaghari-Ratcliffe and Ashoori, the
House of Commons Foreign Affairs Committee opened an inquiry into
"state hostage diplomacy” and later issued its report,
Stolen years. On 7 July 2022, The Royal Navy of Britain reported that one of its warships had arrested smugglers in international waters south of Iran early this year after seizing Iranian armaments, including surface-to-air missiles and cruise missile engines.
2023 sanctions on Iran In April 2023, the European Union, along with Britain, imposed sanctions on over 30 Iranian officials and organizations, including units of the revolutionary guards, due to their involvement in
human rights abuses during the crackdown on the
Mahsa Amini protests. In response, Iran threatened sanctions of their own. In July 2023 the UK government said it planned to sanction officials from Iran. The UK's foreign secretary said that since 2022 there had been "15 credible threats by Iran's regime to kill or kidnap Britons or UK-based people".
2024-present In January 2024, the UK government imposed sanctions on Unit 840 and several of its members, including
Mohammad Reza Ansari, for their involvement in hostile activities, such as planning and conducting attacks, including assassinations and threats to life, in countries other than Iran, including the UK. This action was part of a broader effort to counter the Iranian regime's attempts to intimidate or kill British nationals or UK-linked individuals, with at least 15 such threats reported since January 2022. Social media accounts attempting to influence inner UK discource that are linked to Iran were discovered in 2024. These accounts amassed a 250,000 following in twitter and dissemenating messaging encourage Scottish independence from the United Kingdom. On 28 November 2024, former British soldier
Daniel Khalife was found guilty of spying for
Iran. His first known contact with
Iranian intelligence occurred in September 2018, soon after he joined the military. The couple had embarked on a motorbike trip around the world, with plans to stay in Iran for only five days. Richard Ratcliffe has urged the UK government to act "more promptly" to help the British citizens currently detained in Iran, as it took the government six years to secure the release of his wife, Nazanin Zaghari-Ratcliffe. Mr. Ratcliffe also stated that traveling to Iran should be "a lot clearer" and that the Foreign Office travel guidelines should clearly reflect "the risks of hostage-taking." In mid-July 2025, the couple were still being held in custody. In May 2025, British counterterrorism authorities arrested five Iranian nationals suspected of plotting an attack on the Israeli embassy in London, with indications pointing to Unit 840 as the orchestrators. The arrests, conducted across various UK cities, are part of one of the most significant counterterrorism operations in recent years. On May 17 2025, three Iranians were charged in Britain with espionage charges, 550
MPs and
Peers wrote a letter to the prime minister demanding ban on IRGC, criticising hijab and chastity laws, calling for Iranian regime change. On 31 July 2025, the United Kingdom joined thirteen allies in a
joint statement condemning what they described as a surge in assassination, kidnapping and harassment plots by Iranian intelligence services in Europe and North America. In 2025, Iran was placed in the highest tier of the foreign influence register in 2025. British government adviser, Jonathan Hall said the “Faces ‘Extraordinary’ Threat from Russian and Iranian Plots”. Hall said Iran uses local criminals in order to perform intimidation, violence and espionage within the United Kingdom.” During the Iran Israel war, the UK defence journal found that social media accounts encouraging Scottish independence went silent after Israel hit the cyber infrastructure of the Islamic Revolutionary Guards Corps. A recent Telegraph article reported that Iran is conducting a "shadow war" to influence and destabilize the United Kingdom through a mix of propaganda, illicit financial activity, and digital disinformation. According to the article, Iranian-linked media outlets, such as
Press TV, continue to promote state narratives online despite being banned from broadcasting in the UK. Financial institutions like Melli Bank and Bank Saderat, both previously sanctioned, still operate in London and have drawn concern for alleged ties to militant financing. Critics argue that the UK government’s response has been insufficient, leaving the country vulnerable to ongoing foreign influence. In February 2026, the British government sanctioned ten Iranian officials, including police chiefs and IRGC members, as well as the
Law Enforcement Forces of the Islamic Republic of Iran (FARAJA), for their role in the brutal suppression of Iranian protesters and in response to the
2026 Iran massacres. During the
2026 Israeli–United States strikes on Iran, Prime Minister of the United Kingdom
Keir Starmer called the Iranian regime "utterly abhorrent", and said that it had backed more than 20 "potentially lethal attacks" in the UK over the last year. He clarified that "it is clear they must never be allowed to develop a nuclear weapon. That remains the primary aim of the United Kingdom and our allies, including the US." On 6 March 2026, UK
counter-terrorism police officers arrested four men in London as part of an ongoing investigation under the
National Security Act 2023. The suspects (Iranian national and three dual British-Iranian citizens) are accused of assisting Iran's foreign intelligence service by conducting surveillance on members, locations, and individuals connected to Jewish communities, such as the one in London. On 1 April, 2026 it was reported that two Iranian drones struck
Castrol oil plant in
Erbil, causing large fires around the facility. ==Trade==