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Last look 9 September 2026 What is the Strait of Hormuz and why does it matter to the UK? It is the thin sea door out of the Gulf. Iran sits on one bank, Oman on the other. In a quiet year about a fifth of the world’s oil and a large share of its seaborne gas squeeze through shipping lanes only two miles wide. Britain does not load most of its crude there. It still feels Hormuz as dearer diesel, heating oil, jet fuel and lorry bills — because the world price moves when that door tightens, and the UK now imports more refined fuel than it used to make at home. |
If you remember one sentence: Hormuz is an energy gate, not a clothes gate. A tanker war there changes the school-run fill-up and the cost of moving a sofa in Doncaster before it changes a Tesco aisle.
16 September 2026. The strait is open in name but very few ships passing and conflict is still reported around the strait.
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Days since US/Israel invasion
200
Days since the war started 28 Feb
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Memorandum of understanding end
30
Days since Window closed 17 Aug
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oil Passing through Hormuz Prior
20m
Pre-war Barrels a day in 2025 · ~125 ships
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oil passing through This week
<2m
Varies per day but very little…
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UK diesel per ltr
£1.93
55-litre fill over £105
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Brent
$108
Approx SEPT World price
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US SPR on hand
285m
Barrels · EIA week of 4 Sep
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World Oil Hormuz
~25%
Barrels of World’s Supply
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*Sources of the figures above are situated at the bottom of this page.
| Iran · north bank · Bandar Abbas, Qeshm, Hormuz Island, Larak |
| Strait of Hormuz Gulf (west) → two-mile lanes → Gulf of Oman and the Indian Ocean (east) |
| Oman · south bank · Musandam peninsula |
The marked shipping lanes sit mostly in Omani water: a two-mile inbound lane, a two-mile outbound lane and a two-mile gap between them. At its tightest the waterway is about 21 miles across.
Where is the Strait of Hormuz?
At the eastern end of the Gulf the water pinches between Iran and Oman’s Musandam hook. West of the pinch are the big oil ports. East is the Gulf of Oman, then the Indian Ocean. There is no other sea door out. Pipelines can move a slice of the oil. Ships cannot skip the pinch.
Iraq, Kuwait, Saudi Arabia’s Gulf terminals, Bahrain, Qatar, the UAE and Iran all send seaborne cargo toward that pinch. Only Saudi Arabia and the UAE have pipelines that can send some oil to the Red Sea or to Fujairah without using the strait. Iraq, Kuwait, Qatar, Bahrain and Iran have almost no sea alternative.
How much oil and gas goes through Hormuz?
| Measure | Figure | Source |
| Oil through Hormuz, 2025 / first half 2025 | about 20 to 21 million barrels a day | IEA; US EIA |
| Share of world oil use | about one fifth | EIA |
| Share of oil moved by sea | about a quarter | IEA; EIA |
| Where most of the crude goes | Asia — China, India, Japan, South Korea | EIA: about 89% of Hormuz crude in first half 2025 |
| Gas | Qatar’s LNG must use the same door | EIA |
The IEA’s 2025 split: Saudi Arabia sent the most through the strait, then Iraq, the UAE, Iran and Kuwait. A fight at Hormuz is a Gulf-export story, not only an Iran story.
Why does Hormuz matter to Britain if most of the oil goes to Asia?
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1 · Hormuz Tankers struggle to leave the Gulf. Less oil reaches the world market that day. |
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2 · Brent The world oil price jumps the same day. Britain pays that price even when the barrel was not coming here. |
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3 · UK fuel Diesel, jet and heating oil follow in days. Jet is the Gulf link; heating oil follows jet, not the petrol pump. |
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4 · The lorry Hauliers add a fuel extra. Milk, parcels and parts already in Britain now cost more to move. |
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5 · The shelf The aisle can still look full. The ticket is higher because step 4 sat inside the price. |
Oil is priced as one pool. When that door tightens, Brent — the yardstick Britain and Europe use — can move the same day. The UK then pays more for the diesel, jet and heating oil it still has to buy, wherever the ship happens to load.
Official DUKES figures for 2025 show the UK as a large net importer of oil products. Diesel came mainly from the United States, the Netherlands and Belgium. Jet is the named Gulf link: Kuwait supplied about 35% of UK jet imports that year; India, Saudi Arabia and the UAE each sent more than a million tonnes. Heating oil in British homes tracks wholesale jet more than it tracks the petrol pump. Scotland has had no crude refinery since Grangemouth closed. That UK fact makes a Hormuz shock louder at the pump and in the tank that heats a farmhouse.
Diesel is also what the delivery lorry burns. Raise diesel and you raise the cost of moving food that is already in the country. That is why fuel can jump in days while a shop shelf still looks full.
Cape versus Hormuz: why they are not the same problem
| Hormuz | Cape of Good Hope | |
| What it is | The only sea door out of the Gulf | The long road around Africa |
| What travels it | Oil, gas, ship fuel | Steel containers from Asia |
| UK feels it as | Dearer diesel, heating oil, jet, haulage | A parcel two weeks later |
| Speed | Days | Weeks |
| First UK door | Immingham and energy terminals | Felixstowe, London Gateway, Southampton |
A late parcel from China is a Cape story. A jump in heating oil after a tanker strike is a Hormuz story.
Can ships go around Hormuz?
Not in any way that replaces the door. Saudi Arabia’s East–West pipeline can send crude to Yanbu on the Red Sea. The UAE can send some crude to Fujairah, which sits on the Indian Ocean side of the strait. Those pipes cover a slice. They do not cover twenty million barrels a day. Iraq, Kuwait, Qatar, Bahrain and Iran have no serious sea bypass. That is what “chokepoint” means here: the other roads are too small.
How tight is Hormuz in September 2026?
Before the war that opened at the end of February 2026, ship-trackers spoke of around 125 large commercial vessels a day through the strait. By 8–9 September visible commodity traffic was down to a handful of ships. Oil was back around $100 a barrel. The United States hit Iranian tankers. Iran said it hit ships in the Strait and the Gulf of Oman. UKMTO, the British desk that warns merchant captains, reported ordinary cargo ships in that fire.
Some oil still leaves with its tracker switched off. Hidden traffic is not the same as safe, insured, normal traffic. Until the normal kind is obvious again, treat Hormuz as tight for UK fuel planning.
Who warns ships in the Gulf?
The United Kingdom Maritime Trade Operations desk — UKMTO — is the British warning point for merchant captains in that region. Insurers matter as much as missiles. If war-risk cover becomes too dear, a strait can still have water in it and still be closed as a business.
What should a UK importer or fleet do?
| If you are | Do this |
| Running lorries or a warehouse | Budget dearer diesel. Expect a fuel extra on haulage quotes. Do not wait for an empty forecourt. |
| Buying jet or heating oil | Watch Kuwait and other Gulf product, and the Rotterdam price. Heating oil follows jet more than the petrol pump. |
| Waiting on a parcel from Asia | That wait is usually the Cape, not Hormuz. See Cape of Good Hope. |
| In Scotland or off the gas grid | You feel imported product with fewer buffers. Plan heating cover earlier than south-east habit. |
Are the sea routes into the UK open? · Immingham · Why UK shops run out
IEA; US EIA chokepoint notes; Britannica on the banks and lanes. UK product trade: DUKES 2025 Chapter 3. 8–9 September 2026: BBC, Bloomberg, Reuters, UKMTO, US military statements. This page is not live ship-tracking.
Sources for the boxes above (checked 16 September 2026)
- 28 February 2026 — traffic through Hormuz fell when the US–Israel war on Iran began. House of Commons Library briefing CBP-10636; CRS report R45281 (updated 7 August 2026); Wikipedia timeline of the 2026 Strait of Hormuz crisis.
- 4 March 2026 — Iran said the strait was “closed”. CRS R45281.
- 17 June 2026 — US–Iran memorandum: fee-free commercial passage for 60 days. CRS R45281; Swedish Club situation note, 24 June 2026.
- 17 August 2026 — that 60-day window ended with no replacement deal. Kpler / Al Jazeera, 20 August 2026 (“Oil flows nearly tripled before US-Iran MoU expired”).
- ~20 million barrels a day — oil (crude and products) through Hormuz in a normal 2025 year; about a quarter of world seaborne oil. IEA / EIA chokepoint notes; CRS R45281.
- ~125 large ships a day — pre-war commercial average cited across 2026 maritime updates (Windward / industry trackers). This week’s “few” is a Passage Brief snapshot from those same trackers, not a live AIS feed.
- Diesel ~193p · Brent ~$108 · 55-litre fill over £105 — RAC Fuel Watch / RAC Foundation, 14–15 September 2026; Brent around $107–$108 on 16 September 2026 (Reuters).
- US SPR 285 million barrels — EIA weekly stocks, week ending 4 September 2026 (285,360 thousand barrels).
- ~14 days of US use · ~106 days at max draw — 285 million ÷ about 20.1 million barrels a day of US consumption ≈ 14 days; 285 million ÷ 2.7 million barrels a day maximum SPR withdrawal ≈ 106 days. EIA / US SPR factsheet as summarised September 2026. This oil is American. It does not sit under a UK pump.
Passage Brief is not a live ship counter. Update diesel, Brent and “few ships” when the Notes page is updated. The UK clock is the pump and the ARA/Immingham rack, not the US reserve.