Britain and the United States have discussed military options to reopen the Strait of Hormuz, a waterway that carries roughly 20–21% of the world’s daily oil consumption and has become one of the most dangerous chokepoints in global shipping since Iran moved to close it in the escalation following the US-Iran conflict that began in early 2026.

British Prime Minister Keir Starmer confirmed a conversation with US President Donald Trump following a phone call, saying the two leaders discussed military options regarding the Strait of Hormuz situation. The disclosure marks the clearest signal yet that Washington and London are preparing coordinated force projection to restore freedom of navigation through the narrow passage between Iran and the Arabian Peninsula.

A Coalition Takes Shape

The UK is leading a coalition of approximately 30 countries to protect vessels transiting the strait, a grouping that Starmer has been assembling through a rapid series of diplomatic visits to the Gulf. According to Downing Street statements, the prime minister traveled to the UAE, Bahrain, and Qatar, having visited Saudi Arabia the day before.

Downing Street said the talks with regional leaders focused on condemning Iranian attacks on Gulf states, reinforcing ceasefire commitments, and reopening the strait. After those meetings, Starmer called Trump to outline what officials described as the UK’s efforts to coordinate with international partners and the need for urgent action to restore shipping operations.

The scale of the coalition suggests this is not a symbolic gesture. It represents one of the largest maritime security operations assembled since the multinational response to Somali piracy over a decade ago. And the stakes are incomparably higher.

Why the Strait Matters

The Strait of Hormuz is a narrow passage connecting the Persian Gulf to the Gulf of Oman and the open ocean beyond. According to the US Energy Information Administration, approximately 17 million barrels of oil per day flow through it, bound for Asia, Europe, and beyond. Around one-fifth of global liquefied natural gas trade and significant volumes of fertiliser pass through these waters as well.

When the strait closes, the effects ripple outward at speed. They show up first at fuel pumps and in energy markets. Then they reach mortgage rates, grocery shelves, and airline tickets. The closure has triggered what economists at Capital Economics and Oxford Economics have described as a compound economic shock: conflict-era energy prices layered on top of existing trade frictions from the US tariff escalation.

The Economic Damage Is Already Spreading

In the UK, the consequences have been severe and swift. According to Moneyfacts data, major lenders including NatWest and HSBC have pulled hundreds of mortgage products from the market. The average two-year fixed mortgage rate has climbed to approximately 5.2%, up from around 4.5% before the conflict, translating to roughly £800–£1,000 more per year for borrowers taking out new deals on a typical £200,000 loan.

The Bank of England held rates steady at 4.5% at its latest policy meeting. Before the war, markets had priced in two or three cuts by year-end. Now interest rate swap markets are pricing in the possibility of a hike, a dramatic reversal in expectations.

Energy bills are surging. Cornwall Insight, the energy consultancy, projects that the typical UK household annual dual-fuel bill could jump to approximately £2,500–£2,700 by the July price cap reset, up from around £1,738 under the previous cap. British households reliant on heating oil have seen costs surge by an estimated 40–50% since the crisis began, prompting the government to allocate £150 million in emergency support distributed through local councils.

Petrol prices tell their own blunt story. RAC Fuel Watch data shows average unleaded petrol has risen to approximately 165p–170p per litre, up from around 140p before the conflict began. Diesel has climbed even more sharply, nearing 180p per litre. The RAC has warned that the war has added roughly £12–£15 to the cost of filling a typical 55-litre family car, and with oil prices consistently above the $100 a barrel mark, further rises look inevitable.

Food, Flights, and the Fear of Duration

Business leaders including the head of the National Farmers’ Union and the British Retail Consortium have put the problem plainly: oil and gas are essential to business operations across the supply chain. The food system is under particular pressure. Fuel and fertiliser costs have surged just as the spring planting season gets under way. The BRC estimates food price inflation could accelerate to 6–8% toward the end of the year if the strait remains closed.

For many Britons, this feels like a painful repeat. Food inflation only recently normalised after reaching a peak of 19.2% in March 2023 in the wake of Russia’s invasion of Ukraine. Ian Wright, the former head of the Food and Drink Federation, has been direct about the outlook: if this goes on for much longer, significant price rises across supermarket shelves are unavoidable.

Airlines, protected in the short term by fuel hedging contracts that typically cover three to six months of consumption, face a different timeline. But aviation analysts at Cirium have noted that persistently high jet fuel prices, now up roughly 30% since the crisis began, could eventually require fare increases of 10–15%. Travel insurance premiums are already climbing. Compare the Market data shows the average single-trip policy for the UAE has risen around 20% year on year.

The cumulative weight of these costs explains why Starmer’s diplomatic sprint through the Gulf carried such urgency. This is not an abstract geopolitical problem. It is hitting household budgets in real time.

Military Options and Their Limits

The phrase military capabilities covers a wide range of possible actions: mine clearance, convoy escort, air patrols, electronic warfare, and in the most extreme scenario, strikes on Iranian coastal defenses and missile sites. Starmer’s language stopped short of specifying what was on the table.

But assembling a multinational coalition and explicitly discussing military options with the US president signals that London and Washington are preparing for the possibility that diplomacy alone may not reopen the strait. The timing is charged. US-Iran talks in Islamabad have been complicated by accusations of a drone strike in Kuwait, and the broader regional picture remains volatile, with Israel and Iran resuming missile exchanges in recent weeks.

A military escort operation through the strait would be logistically demanding. Iran’s coastline runs along the strait’s northern edge, bristling with anti-ship missiles, fast-attack craft, and mine-laying capabilities refined over decades. The geography favors the defender. The strait narrows to shipping lanes roughly two miles wide in each direction, separated by a two-mile buffer zone.

Any naval operation would also test the durability of alliance structures already under strain. The coalition’s members have not been publicly named. Which nations contribute warships, which contribute diplomatic cover, and which simply lend their flags to the effort will reveal the actual depth of commitment.

What Comes Next

The UK’s leading role is striking. Britain has a long history of naval presence in the Gulf, but the country’s post-Brexit foreign policy has often struggled to define its global ambition. Coordinating a coalition of this size, and doing so alongside but distinct from the United States, represents a significant assertion of British strategic relevance.

Starmer’s government appears to be betting that the economic pain from the strait’s closure gives it both domestic justification and international leverage. Every day the strait stays closed, the costs mount. The question is whether Iran calculates the same way, or whether the threat of a multinational naval operation hardens Tehran’s position rather than softening it.

The strait itself is indifferent to politics. It is a narrow passage of warm water between two shorelines, through which the modern global economy has long depended on free passage. That passage is now closed. And the leaders of two of the world’s most powerful military states have discussed, openly, how to force it back open.

What happens in that narrow channel over the coming weeks will shape energy markets, alliance politics, and the broader arc of the Iran conflict. The economic damage is already measured in mortgage rates and petrol prices and food costs. The risks to medicine and food supplies grow more acute with each passing week. The military discussion between Starmer and Trump suggests both governments believe time is not on their side.

Photo by Alimurat Üral on Pexels