The Strait of Hormuz is one of the most strategically important pieces of geography on the planet. Barely 33 kilometres wide at its narrowest point, it is the only sea passage connecting the Persian Gulf – and the vast oil and gas fields that surround it – to the rest of the world. When Iran effectively closed it in early 2026, the consequences were felt in every British household.
If you have wondered why your energy bills went up, why petrol prices surged, and why the world seemed suddenly on the brink of a much wider war, the Strait of Hormuz is central to the answer.
Where is it?
The Strait of Hormuz sits between Iran to the north and the Sultanate of Oman and the United Arab Emirates to the south. It connects the Persian Gulf – the body of water bordered by Iran, Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain, the UAE and Oman – to the Gulf of Oman, which leads into the broader Indian Ocean and from there to the rest of the world.
It is, in the most literal sense, a bottleneck. All the oil and gas produced in the Persian Gulf must pass through this narrow channel to reach global markets – unless it takes far longer and more expensive overland or pipeline routes.
Why is it so important?
The numbers tell the story. Before the Iran war began, approximately 21 million barrels of oil passed through the Strait of Hormuz every single day. That represents roughly 20% of all the oil traded globally – and around 30% of all liquefied natural gas. The countries whose oil flows through Hormuz include Saudi Arabia, the UAE, Kuwait, Iraq, Bahrain and Qatar – some of the world’s largest producers.
No other single point on earth concentrates this much energy traffic. The Panama Canal is economically significant. The Suez Canal matters enormously for trade. But neither comes close to the Strait of Hormuz in terms of its impact on the global energy system.
What happened in 2026?
When the United States and Israel launched strikes on Iran in late February 2026, Iran retaliated by effectively closing the Strait. Iranian forces warned that any vessel attempting transit without Iranian permission would be destroyed. The threat was credible – Iran has significant naval capabilities in the Gulf, including fast attack craft, submarine forces, anti-ship missiles and an ability to lay mines in the shallow waters of the strait.
The closure was not total from day one, but it was sufficient to cause the vast majority of shipping companies to halt transits. Around 300 to 400 ships queued in the Gulf unable to exit. The price of Brent crude oil surged from around $75 a barrel before the war to over $116. Energy markets across Europe went into shock.
In Britain, the consequences were direct and immediate. Energy bills – already elevated by post-Covid inflation – faced further rises. Petrol prices at the pump climbed. The Bank of England issued warnings about stagflation. The government scrambled to accelerate renewable energy approvals, citing the Iran war as proof that dependence on global fossil fuel markets was a strategic vulnerability.
Why can’t ships just go another way?
In principle, some oil can be rerouted. Saudi Arabia has an East-West pipeline that carries oil from its Gulf fields to the Red Sea, bypassing the Strait entirely. The UAE has a pipeline to Fujairah on the Gulf of Oman coast. But these alternative routes have limited capacity – they can handle perhaps a quarter of the volumes that normally pass through Hormuz at most. During the conflict, even Saudi Arabia’s pipeline was struck by a drone attack during the ceasefire period.
For liquefied natural gas, there is effectively no alternative route from the major Gulf producers. Qatar, the world’s largest LNG exporter, has no pipeline alternatives. Its gas simply cannot reach global markets without passing through Hormuz.
Who controls it?
This is the question at the heart of the ceasefire negotiations. Iran’s coastline forms the entire northern shore of the strait, giving it a geographic dominance that no other country can match. Under international maritime law, the strait is subject to “transit passage” rights – meaning all ships have the right to pass through, even through territorial waters, as long as they do so continuously and expeditiously.
Iran has periodically threatened to close the strait, and its ability to do so in practice – at least temporarily and partially – has been demonstrated by the 2026 conflict. The ceasefire terms, as reported, appeared to give Iran some form of continued supervisory role over traffic, including the right to charge tolls – demanded in Bitcoin to avoid sanctions – of $1 per barrel of oil.
Gulf states including Saudi Arabia have described any form of Iranian control over the strait as a “red line.” The ultimate resolution of who controls Hormuz – and on what terms – remains one of the central unresolved questions of the 2026 conflict.
Why does it matter for Britain specifically?
Britain is more exposed to Hormuz disruption than many people realise. While the UK produces some of its own oil and gas from the North Sea, it is a net energy importer and its prices are set by global markets. When global oil prices surge because of a Hormuz closure, British energy bills rise regardless of where the specific molecules of gas powering British homes actually come from.
The 2026 Iran war provided a vivid demonstration of this vulnerability – and has strengthened the arguments of those who say Britain needs to accelerate its transition to domestically generated renewable energy. Solar and wind power, as the Energy Secretary Ed Miliband has repeatedly noted, cannot be blockaded. The sun shining over Lincolnshire is not affected by events in the Persian Gulf.
Whether Britain will take that lesson seriously, or return to fossil fuel dependence once the immediate crisis passes, is one of the defining policy questions of the post-war period.
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