UK Fuel Prices September 2026 — Houthis and Iran Explained

UK petrol hit 170.54p per litre and diesel 192.86p on 15 September 2026, the highest since summer 2022. A fill-up for a family car now costs £94 for petrol and £106 for diesel, up almost £5 since the start of the month alone. The cause is a rapidly deteriorating geopolitical situation in the Middle East, with two critical oil export routes now simultaneously under threat. Here is what is happening, why it is driving prices higher, and what it means for UK drivers.

170.54p

Average UK petrol price per litre, 15 September 2026, highest since August 2022 (RAC)

192.86p

Average UK diesel price per litre, 15 September 2026, highest since July 2022 (RAC)

+£5

Extra cost to fill a family car since the start of September 2026 (RAC)

The two chokepoints — what is happening

Global oil supply is being squeezed at two critical points simultaneously. This is the central reason UK pump prices are rising rapidly.

The Strait of Hormuz

The Strait of Hormuz, between Iran and Oman, carries approximately 20% of the world's seaborne oil. Since the US-Israel conflict with Iran began on 28 February 2026, the strait has been effectively closed to normal commercial tanker traffic. Iran's Islamic Revolutionary Guard Corps (IRGC) has stated the strait remains under its control and will stay closed while US military operations continue. The IRGC warned that no tanker will be permitted to enter or leave without coordinating with Tehran.

Saudi Arabia responded by routing oil exports westward through a pipeline to its Red Sea port of Yanbu, bypassing the strait entirely. This kept Saudi crude flowing to international markets, until the Houthis intervened.

The Red Sea and Bab al-Mandeb Strait

Yemen's Houthi rebels, backed by Iran, declared a naval blockade on Saudi Arabian shipping through the Bab al-Mandeb Strait on 21 July 2026. The strait is the southern gateway linking the Red Sea to the Gulf of Aden and Indian Ocean. They said they would target Saudi, Israeli and US-linked tankers in the Bab al-Mandeb.

On 23 July, the Houthis followed through. They attacked two Saudi Arabian oil tankers, with a Saudi news agency later confirming that one vessel was set ablaze. Oil markets reacted immediately. Brent crude futures rose $4.89, or 5.16%, to $100.36 per barrel, the highest since early June, as traders priced in the risk of simultaneous disruptions at both the Strait of Hormuz and the Bab al-Mandeb Strait.

The consequences of a full Bab al-Mandeb closure are severe. A full closure would halt Saudi oil exports to Asia and could reduce global oil supply by 7%. Ships rerouting via Africa rather than the Suez Canal face an additional 10,000 nautical miles and 34 extra days at sea, with additional freight costs exceeding $5 million per vessel. The Suez Canal cannot handle the largest class of oil tankers, the Very Large Crude Carriers that can carry upwards of 2 million barrels.

Who are the Houthis and why are they doing this?

The Houthis are a Yemeni rebel group that has controlled much of northern Yemen, including the capital Sanaa, since 2014. They are formally known as Ansar Allah and are aligned politically and militarily with Iran. Their attacks on Red Sea shipping are a deliberate extension of the wider Iran-US-Israel conflict. The Houthis have positioned themselves as Iran's most capable proxy force for disrupting global oil supply.

The Houthis began attacking Red Sea shipping in late 2023 in response to the Gaza conflict, and those attacks never fully stopped. The July 2026 naval blockade declaration represents a significant escalation. This involves moving from targeting random commercial vessels to specifically targeting Saudi oil tankers using the Red Sea as an alternative export route.

The political calculation is straightforward: by threatening Saudi oil exports, the Houthis increase financial pressure on Saudi Arabia and simultaneously reduce global oil supply, raising revenues for Iran from the oil it does manage to export through back channels. A Chinese-flagged tanker was observed securing Houthi clearance to pass through the Bab al-Mandeb Strait after making two U-turns, in what appeared to be a sign that Chinese-linked vessels retain a measure of safe passage, reflecting the Houthis' selective enforcement aligned with Iran's geopolitical relationships.

Why does this push up UK fuel prices?

The UK does not buy significant amounts of oil directly from Saudi Arabia or Iran. So why do events in the Red Sea affect what British drivers pay at the pump?

The answer is that oil is a globally traded commodity priced on international benchmarks. Brent crude, the benchmark that determines UK wholesale fuel costs, is set by supply and demand across the entire global market. When supply is threatened anywhere in the world, the price rises everywhere. A disruption to Saudi exports to Asia tightens global supply, which pushes up Brent, which pushes up the wholesale cost of petrol and diesel, which eventually appears at UK forecourts.

The lag between an oil price spike and UK pump prices is typically one to two weeks, depending on how quickly retailers pass on their increased costs. Since the start of September, the average price of petrol has risen by around 9p per litre, consistent with Brent crude consistently trading above $100 a barrel throughout the month.

Insurance premiums — the hidden cost driver

Beyond the oil price itself, there is a second mechanism pushing up fuel costs that receives less attention. War risk insurance premiums for tankers rose to around 0.75% of the value of a ship from around 0.3% before the Houthi blockade announcement. A ship worth $100 million now costs $750,000 to insure for a single voyage through these waters. These costs are passed on throughout the supply chain and ultimately to the pump price.

Could diesel really hit £2 a litre?

The RAC's head of policy Simon Williams has warned that diesel may be on course to surpass £2 a litre, exceeding the previous record high of 199.05p set on 25 June 2022. At 192.86p today, diesel is just 6p below that record. If Brent crude remains above $100 and the current trajectory continues, the record could fall within days.

Petrol at 170.54p is further from its all-time record of 191.53p set in July 2022, but is rising at its fastest pace since the original conflict spike in spring 2026.

The January 2027 duty rise — arriving at the worst possible time

As if rising wholesale costs were not enough, UK drivers also face a confirmed tax increase. The temporary 5p fuel duty cut, in place since March 2022, expires at the end of 2026. From 1 January 2027, duty rises by 3p per litre, with a further 2p in March 2027. At current prices, adding 3p per litre would push petrol towards 174p, a level not seen since 2022.

The timing could not be worse. Drivers are already absorbing the steepest price rises in four years, and the tax headwind arrives in less than four months. See our full fuel duty guide for the complete timeline and what it costs at different mileages.

What can UK drivers do right now?

With prices rising and the geopolitical situation showing no sign of early resolution, the practical actions that save money are more important than ever:

Check prices before every fill-up. At 170p average petrol nationally, the gap between the cheapest and most expensive nearby stations is typically 10-15p per litre, worth £5-8 on a 55-litre fill-up. Use our live map, updated every hour.
Fill up at supermarkets. Supermarkets are currently averaging around 159p for unleaded, approximately 11p below the national average. That is a £6 saving on a full tank.
Fill up sooner rather than later if you can. With prices rising consistently, deferring a fill-up is likely to cost you more.
Avoid motorway services. Currently 15-25p above nearby alternatives. At current prices, that difference on a full tank could be £14 or more.
Drive more efficiently. At 170p per litre, the savings from a 10% MPG improvement are more valuable than ever. Our MPG guide covers 15 proven techniques.

What happens next?

The outlook depends entirely on geopolitics. Three scenarios:

Escalation: petrol could approach 190p

If the Houthi blockade of the Bab al-Mandeb Strait takes full effect and Brent crude pushes above $120, petrol could approach its 2022 all-time record of 191.53p within weeks. This scenario requires no diplomatic breakthrough, just the continuation of the current trajectory.

Stalemate: prices hold at 165-175p

The conflict continues but does not significantly escalate. Oil markets maintain a $100+ risk premium. UK petrol holds in the 165-175p range through autumn. The fuel duty rise in January adds a further 3.6p regardless.

De-escalation: prices could fall back to 150p

A diplomatic breakthrough reopens either the Strait of Hormuz or the Red Sea. This requires political progress that has failed to materialise repeatedly in 2026, but remains possible.

Track real-time UK petrol and diesel prices at your nearest stations using our live fuel price map, updated every hour from official Government Fuel Finder data. Our price trends chart shows the full 2026 price journey.