Oil prices surged. A British couple in an Iranian prison went on hunger strike. And a US president announced a 20% toll on ships passing through one of the world's most vital waterways – then abandoned the idea just 24 hours later. The Strait of Hormuz, a narrow channel connecting the Persian Gulf to the open ocean, has become the flashpoint of a four-month-old war between the United States and Iran. Here's what you need to know about the conflict and why it affects everyone from drivers at the petrol pump to UK citizens held abroad.
At its simplest, the Strait of Hormuz is a 33-kilometre-wide stretch of water between Iran and Oman. About a fifth of the world's oil passes through it – roughly 20 million barrels per day. That makes it a strategic chokepoint that both the US and Iran have used as leverage. In July 2026, President Donald Trump announced a naval blockade on Iranian shipping, then said all vessels transiting the strait must pay a 20% fee to reimburse the US for providing security. The next day, he scrapped that plan and instead offered trade and investment deals to Gulf allies. The about-face suggests, according to analysts, a president searching for unorthodox ways out of a difficult position. The US has been launching airstrikes on Iranian targets, while Iran has stepped up attacks on commercial shipping, grinding traffic through the strait to a near standstill. A temporary ceasefire, agreed in a memorandum of understanding a month earlier, collapsed when Trump declared the truce over and called Iranian leaders 'scum'.
“An explainer on the US-Iran conflict over the Strait of Hormuz and its global impact.”
This conflict did not start overnight. The US and Iran have been adversaries for decades, but tensions escalated sharply after Trump withdrew from the 2015 nuclear deal – the Joint Comprehensive Plan of Action negotiated by the Obama administration – and reimposed sanctions. In the spring of 2026, what began as skirmishes spiralled into open war. The US has achieved military objectives, destroying Iranian ships, planes and defence capabilities, but politically the conflict remains far from resolved. Wars of attrition, as one expert put it, tend to go on for a long, long time.
For UK readers, the consequences are both global and personal. The surge in oil prices after the strait was threatened directly affects household fuel bills and the wider economy. Britain also has citizens caught in the middle: Craig and Lindsay Foreman, arrested on a motorbike tour 18 months ago, are serving 10-year sentences on espionage charges they deny. They have been on hunger strike for more than two months, and Craig recently had two more years added to his sentence for speaking to the press. The UK is not a direct combatant, but as a US ally it faces pressure to support the blockade or risk the strategic relationship. Meanwhile, instability in the region threatens global shipping lanes that carry everything from oil to consumer goods.
Q: Why is the Strait of Hormuz so important? The strait is a narrow passage through which about 20% of the world's oil supply travels. If it were blocked, oil prices would spike dramatically, affecting economies worldwide. That is why both the US and Iran see it as a key weapon in the conflict.
Q: What is the current status of the US-Iran war? As of July 2026, the war is in its fourth month. The US has carried out multiple waves of airstrikes and reinstated a naval blockade. Iran has retaliated by attacking commercial shipping. A ceasefire collapsed after Trump called it off. The US Senate has blocked a key defence bill amid accusations that Trump started the war without congressional approval.
Q: How does this affect ordinary people in the UK? Higher oil prices mean more expensive petrol and home heating. The conflict also creates uncertainty for UK businesses that rely on global trade. And there is a humanitarian dimension: British citizens are being held in Iranian prisons, with families urging the government to intervene.
What happens next is uncertain. Trump has discussed launching a massive offensive to force Iran to reopen the strait, but he has also signalled willingness to strike trade deals with Gulf allies instead. US military strikes continue, and Iran shows no sign of backing down. With no clear exit strategy and domestic opposition growing, the war could drag on – and the Strait of Hormuz will remain the centre of gravity.