The crisis over an oil tanker seized by Iran has roiled UK politics ahead of a potentially contentious week in which Boris Johnson is likely to take over as prime minister from Theresa May.

But in Iran, it has unified Tehran’s squabbling factions against an old adversary, the UK, long considered an untrustworthy imperial power.

“The Queen’s thieves captive in the strait,” the conservative Resalat newspaper declared.

The capture of the Stena Impero in the Strait of Hormuz came just 15 days after the UK seized the Grace 1, a tanker filled with Iranian oil, off the coast of Gibraltar in a move that has been decried by the Islamic republic.

It came hours after a Gibraltar court announced it would hold the ship for another month while its destination is investigated.

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On Sunday, Ali Larijani, speaker of Iran’s parliament said the Revolutionary Guard (IRGC) seized the oil tanker as a direct response to the “theft” of the Grace 1 by British forces.

“The British stole a ship, and the IRGC responded to them,” Mr Larijani, who has the ear of both Supreme Leader Ali Khamenei and President Hassan Rouhani, was quoted as saying by local media.

Iran’s parliament, often engaged in factional infighting, issued a statement thanking the Revolutionary Guard for seizing the Stena Impero.

“Tanker for tanker; Iran acted on its pledge,” the newspaper Kayhan​, whose editor is appointed by Mr Khamenei, said on its front page.

“The seizure of an oil tanker for the capture of an oil tanker,” the pro-reform newspaper Ebtekar said in a front page headline, with another reformist-leaning newspaper praising Iran’s “diplomacy of power”.

The seizure of the UK-flagged ship by the Revolutionary Guard appears to signal a more aggressive posture by Tehran in the crisis rooted in Donald Trump’s withdrawal last year from the landmark nuclear deal and vow to prevent international buyers from purchasing Iran’s oil.

Iran gave other partners in the nuclear deal a year to circumvent the US sanctions but grew angry as its oil exports collapsed. Iran allegedly began launching attacks on Gulf shipping, targeting US allies Saudi Arabia and the United Arab Emirates, almost a year after Mr Trump scuttled US participation in the nuclear deal.

The Grace 1 after it was detained off the coast of Gibraltar this month (AFP/Getty) (AFP/Getty Images)

The seizure of the Grace 1, on accusations it was violating EU sanctions by transporting oil to Syria, added to Tehran’s suspicions that the UK and other European supporters were quietly collaborating with Mr Trump’s “maximum pressure” campaign.

Diplomats and analysts suspect the UK was hoodwinked into doing the bidding of conservative hawks in the White House, such as national security adviser John Bolton, by seizing the Grace 1.

Though the UK has insisted that it was enforcing EU rules by preventing crude from reaching Syrian dictator Bashar al-Assad, Iran insists the oil was not heading to Syria. The EU has yet to speak a word about the Grace 1, even as it voiced support for the UK after the seizure of the Stena Impero.

“Having failed to lure Donald Trump into War of the Century, and fearing collapse of his B-team, John Bolton is turning his venom against the UK in hopes of dragging it into a quagmire,” Iran’s foreign minister, Mohammad Javad Zarif, wrote on Twitter.

UK-Iran radio exchange released after tanker seized in Gulf

But even as Mr Zarif called for “prudence and foresight”, and some Iranian news outlets and officials were seeking to downplay the Stena Impero seizure, video released by the Revolutionary Guard showed black-masked Iranian commandos rappelling from a helicopter on to the ship in an apparent emulation of how the seizure of the Grace 1 was described.

Many Iranians fear and oppose any military confrontation with the US or its allies. But with the crew of the Stena Impero apparently safe and accounted for, few were speaking of war.

Britain’s junior defence minister Tobias Ellwood said the UK may pursue sanctions against Iran for the seizure, though it remains unclear what such restrictions would entail as Britain has mostly avoided trade with Iran since the reimposition of US sanctions.

“We are going to be looking at a series of options,” he told Sky News. “We will be speaking with our colleagues, our international allies, to see what can actually be done.”

Iran can also count on Russia and China to protect it at the UN Security Council. On 24 June, the Security Council condemned escalating attacks on Gulf shipping but declined to single out Iran.