Strait of Hormuz Crisis 2026: How the Iran War Is Hitting UK Energy Bills, Petrol Prices, and Household Costs

Direct answer

The 2026 Iran war and Strait of Hormuz blockade have removed roughly 20% of global oil supply from the market (IEA, Oil Market Report March 2026), pushing Brent crude above $128/barrel, UK petrol past 157p/litre, and diesel past 190p/litre (RAC Fuel Watch; PetrolPrices, April 2026). The Ofgem energy price cap is expected to jump approximately 20% to around £1,973 from July 2026 (Cornwall Insight, via Energy UK). UK inflation is forecast to rise to 3.5–4% by autumn (KPMG; CNBC), and food prices could rise by 9–10% by year-end (FDF). A fragile two-week ceasefire took effect on 8 April (CNBC), temporarily crashing oil prices, but uncertainty remains high. UK households should review their energy tariffs, understand the trade-offs between fixing and staying variable, and review all household bills before costs rise further.

What is the Strait of Hormuz crisis?

The Strait of Hormuz is a narrow waterway between Iran and Oman. It is one of the most important energy chokepoints in the world. Under normal conditions, approximately 20 million barrels of oil pass through it every day, roughly one-fifth of all global oil traded by sea (Wikipedia, Strait of Hormuz). It also carries around 20% of the world's liquefied natural gas (LNG) and about a third of globally traded fertiliser (Kpler).

On 28 February 2026, the United States and Israel launched a coordinated military operation against Iran known as Operation Epic Fury (Britannica). Iran retaliated by closing the Strait of Hormuz to commercial shipping. The closure was confirmed on 2 March, and insurance providers immediately withdrew coverage for vessels transiting the strait (Wikipedia, 2026 Strait of Hormuz crisis). Commercial shipping through Hormuz collapsed by more than 90% within days (Euronews).

The conflict escalated through March 2026. Iran attacked at least 21 merchant ships, and the US deployed three carrier strike groups and 2,500 Marines to the region (Wikipedia, 2026 Strait of Hormuz crisis). Despite military efforts to reopen the waterway, it remained effectively closed through early April.

On 7-8 April, Pakistan brokered a two-week ceasefire, with Iran agreeing to allow limited safe passage through the strait (Yahoo Finance). Oil prices dropped sharply on the news, with Brent crude falling below $95 per barrel (CNBC). However, the ceasefire is fragile, and the negotiations scheduled for 10 April face significant obstacles (Wikipedia, 2025-2026 Iran-United States negotiations).

The International Energy Agency (IEA) has described this as the largest disruption to global energy supplies in history (IEA, Oil Market Report March 2026).

How has the crisis affected oil and petrol prices?

The supply shock has been dramatic and immediate.

Global oil prices

Brent crude surged from approximately $71 per barrel before the crisis to a futures peak near $128 per barrel in early April (Kpler). Physical "Dated Brent", the benchmark used to price actual cargoes, hit an all-time record of $144.42 on 7 April (Bloomberg). The ceasefire announcement brought prices back below $95 (CNBC), but that is still around 32% above pre-crisis levels.

The US Energy Information Administration now forecasts Brent averaging $96 for 2026 overall, with a peak around $115 in the second quarter (Anadolu Agency). JPMorgan has warned that prices could overshoot $150 if the disruption extends into mid-May (Finance Magnates).

UK petrol and diesel prices

At the pump, UK drivers have experienced the steepest monthly price rises ever recorded (Fleet News). According to the RAC, average unleaded petrol has climbed from approximately 132p to around 157.5p per litre, a 19% increase (RAC Fuel Watch). Diesel has risen from around 142p to over 190p per litre, a 34% jump (PetrolPrices, April 2026).

Filling a typical 55-litre diesel tank now costs roughly £104.50, which is around £26.50 more than before the crisis. Some sources report prices have reached as high as 187p per litre on average nationally (UK News Blog).

Regional variation is significant. Some London forecourts and motorway service stations have reported prices above 200p per litre, and some independent filling stations in rural areas have closed entirely due to supply difficulties (Brumble).

UK natural gas and energy prices

UK wholesale natural gas prices have surged in parallel. NBP gas climbed from approximately 78p per therm to a peak of 175p per therm before settling around 136p per therm (Smart Energy UK). European TTF gas nearly doubled immediately after the conflict began and hit a 52-week high (Investing.com).

European gas storage stands at approximately 28%, the lowest level since the 2022 energy crisis following Russia's invasion of Ukraine (Energy Solutions). Damage to Qatar's Ras Laffan LNG facility, one of the world's largest, has taken roughly 17% of capacity offline, with repairs expected to take three to five years (Al Jazeera).

What does this mean for UK energy bills?

Energy bills are the area where most UK households will feel the impact most directly, and the worst is still to come.

The current Ofgem price cap

The Ofgem energy price cap for April to June 2026 was set at £1,641 per year for a typical dual-fuel household (Ofgem). This was announced before the crisis began and actually represents a 6.6% decrease from the previous quarter. Households on standard variable tariffs are currently protected at this level.

The July price cap: expect a sharp rise

The next Ofgem cap, covering July to September 2026, will be announced on 27 May. This cap will reflect wholesale energy costs from the conflict period. Cornwall Insight projects it will rise to approximately £1,973, a roughly 20% increase (Energy UK). Some analysts have warned that a prolonged conflict could push it toward £2,500 (Inkbrief).

Heating oil households face immediate pain

Households that rely on heating oil, approximately 1.5 million homes in the UK, mostly in rural areas, have no price cap protection. Heating oil prices have roughly doubled since the crisis began (Brumble). The government has announced a £53 million fund for heating oil-dependent households (GOV.UK), but this amounts to only around £35 per household.

National energy debt is at record levels

Total UK energy debt has reached a record of between £4.5 billion and £5.5 billion, with millions of households already in arrears before the crisis began (National Energy Action; Energy UK).

How is the crisis affecting UK inflation?

The February 2026 CPI reading of 3.0% was the last data point before the war (House of Commons Library). It is now widely expected to rise significantly.

Current inflation trajectory

Core inflation was already sticky at 3.2% in February, and services inflation was running at 4.3% (CNBC). The Bank of England had previously expected inflation to reach its 2% target by April 2026. That expectation has been abandoned.

Post-crisis forecasts

The Bank of England's March Monetary Policy Committee acknowledged the crisis directly, noting that conflict in the Middle East had caused a significant increase in global energy and commodity prices (Bank of England, March 2026 MPC Minutes). The Bank now expects CPI of 3.0-3.5% through the second and third quarters of 2026.

External forecasters are more pessimistic. KPMG forecasts inflation peaking at 3.6% in September (KPMG). ING projects 3.5-4.0% by autumn (Investing.com). Bank of America sees 4.1% in the fourth quarter (CNBC), which would represent a reversal of approximately two years of disinflation progress.

Food prices

Food inflation deserves particular attention. Currently running at approximately 3.3% (Trading Economics), the Food and Drink Federation has revised its year-end forecast upward to 9-10% (FDF). This is driven by surging energy costs in food manufacturing, disrupted fertiliser supply chains from the Gulf region, rising diesel costs affecting distribution, and increasing packaging costs linked to petroleum-based materials (Food Manufacture; The British Eye).

How does this compare to previous oil shocks?

Understanding historical parallels helps put the current situation in context.

Russia-Ukraine war (2022)

The closest recent comparison. Brent peaked at $139 (Wikipedia, Economic impact of the 2026 Iran war). UK CPI hit 11.1% in October 2022, the highest in 41 years (House of Commons Library). Petrol reached a record 191.6p per litre (House of Commons Library, Petrol and Diesel Prices). The government spent approximately £27 billion on the Energy Price Guarantee (ECIU). The key difference from the current crisis is that Russian oil was rerouted to alternative buyers. The Hormuz closure physically prevents oil from leaving the Gulf.

1973 OPEC oil embargo

Oil prices quadrupled from approximately $3 to $12 per barrel over six months (Wikipedia, 1973 oil crisis). UK inflation exceeded 24% (Economics Help). The government imposed a three-day working week. The Heath government fell, and the UK ultimately required an IMF bailout in 1976. Today's economy is less oil-dependent, oil's share of primary energy has fallen from around 46% to approximately 30% (Al Jazeera) but the parallels around energy weaponisation are striking.

1979 Iranian Revolution

Oil prices doubled despite a relatively modest 4% supply reduction, as panic buying and speculative hoarding amplified the shock (Real Investment Advice). UK interest rates reached 17%. This episode is a reminder that market psychology can magnify the impact well beyond the actual supply loss.

1990 Gulf War and 2019 Saudi Aramco attacks

These offer more optimistic templates. The 1990 oil price spike (around 90%) reversed within nine months once military operations restored confidence (Real Investment Advice). The 2019 Aramco attack, technically the largest single supply disruption ever at 5.7 million barrels per day, saw prices return to pre-attack levels within two weeks because Saudi Arabia restored production rapidly (Baker Institute).

The critical variable: duration

The historical lesson is consistent: short disruptions with clear resolution paths cause limited economic damage. Prolonged disruptions cause deep structural harm. The current Hormuz closure has lasted five weeks, already longer than the 1990 and 2019 episodes. How long the ceasefire holds is the single most important question for UK consumers.

What does this mean for your household bills?

The crisis is pushing up costs across energy, fuel, and food. Here is what is happening and what you can do.

Energy bills

What's happening: The current Ofgem cap of £1,641 shields you until June (Ofgem), but the July cap is expected to rise approximately 20% to around £1,973 (Cornwall Insight, via Energy UK). If the crisis worsens, it could go higher.

The key dilemma - fix or stay variable? This is the most important energy decision facing UK households right now, and there is no single right answer. Here's why it's complicated:

Right now, there is not a single fixed deal on the market that is cheaper than the current April price cap of £1,641 (MoneyWeek; MoneySavingExpert). The Hormuz crisis has caused suppliers to hike fixed tariff prices or withdraw them entirely. That means if you fix today, you will pay more than the current variable rate in the short term.

However, if the crisis drags on and the July cap jumps to £1,973 or higher as expected, a fixed deal locked in now, even at a few percent above the current cap, could save you money over the next 12 months compared to riding the variable rate through what could be a sustained spike.

On the other hand, if the ceasefire holds and wholesale prices stabilise, the July cap may rise by less than feared, and cheaper fixed deals could return to the market. In that scenario, locking in at today's elevated fixed rates would leave you paying more than you needed to.

As Martin Lewis put it on MoneySavingExpert: whether you should fix depends on how risk-averse you are and what you think will happen. If you are on the price cap and the turmoil ends before July, staying variable could be the best outcome. But if the crisis persists, grabbing a fix that is only a couple of percent above the current cap may work out better and give you peace of mind (MoneySavingExpert).

There are also middle-ground options worth considering. Some suppliers now offer "discounted price cap" tariffs, variable tariffs that track below the Ofgem cap by a fixed percentage. Others offer "fix-and-fall" deals where your rate is fixed but can drop if the cap falls. Home Energy currently offers a variable tariff approximately 8% cheaper than the price cap (MoneySavingExpert).

Off-gas households using heating oil face the most acute pressure and should explore the government's £53 million emergency fund (GOV.UK).

How Taupia helps: This is exactly the kind of moment where understanding your own situation matters most, and where most people get stuck. Taupia reads your current energy bill, shows you what you are actually paying today, and lays out the available options from 19+ UK suppliers side by side. It helps you understand the different scenarios, what happens if you fix now, what happens if you stay variable and the cap rises, what the risks are either way, so the decision is clearer and simpler. The goal is not to tell you what to do. It is to make sure you never fail to act simply because the situation felt too confusing to navigate. You stay in control of your bills, and Taupia makes sure you have the clarity to make your own informed choice. And because Taupia monitors continuously, it keeps watching the market as the situation evolves, so you do not have to.

Petrol and diesel

What's happening: Unleaded is averaging 157.5p per litre and diesel 190p per litre (RAC Fuel Watch). Some areas are already above 200p per litre. The ceasefire may ease pressure, but prices are unlikely to return to pre-crisis levels quickly.

What to do: Use supermarket forecourts, which are typically 3-4p per litre cheaper than branded stations. Price comparison tools like PetrolPrices and Fuel Finder UK can identify the cheapest nearby options. Consider whether any regular journeys could be consolidated, shared, or shifted to public transport.

Food and groceries

What's happening: Food inflation is currently around 3.3% (Trading Economics) but the Food and Drink Federation forecasts it could reach 9-10% by the end of 2026 (FDF). This is driven by higher energy and transport costs flowing through the supply chain, disrupted fertiliser imports from the Gulf, and rising petroleum-based packaging costs (Food Manufacture; The British Eye).

What to do: Budget for meaningfully higher grocery costs in the second half of the year. Consider bulk buying non-perishables, shifting to own-brand products where possible, and using cashback and loyalty schemes to offset rising prices.

Broadband and mobile

What's happening: While broadband and mobile prices are not directly driven by the Hormuz crisis, many providers apply annual mid-contract price rises linked to CPI or RPI inflation. With inflation now expected to rise sharply, households on contracts with inflation-linked increases could see their broadband or mobile bills go up by 3-5% or more at their next annual review. When energy, fuel, and food costs are all climbing, overpaying on broadband or mobile because you have not reviewed your deal becomes even more costly.

What to do: Check when your broadband and mobile contracts end. If you are out of contract, you are almost certainly overpaying. Even if you are in contract, it is worth understanding what alternatives exist. Taupia monitors broadband and mobile alongside energy, tracks renewal dates, and alerts you when a better deal is available, so you are not silently paying more than you need to on any household bill.

What is the UK government doing?

Chancellor Rachel Reeves has ruled out a repeat of the 2022 blanket energy bailout, which cost approximately £40 billion, citing government debt at 94.8% of GDP and limited fiscal space (NIESR; Institute for Government). Instead, the government response has been targeted (GOV.UK):

• Fuel duty: The existing 5p per litre fuel duty cut has been maintained until August 2026.
• Heating oil support: £53 million allocated for heating oil-dependent households.
• Retailer margins: Enhanced CMA powers to monitor fuel retailer margins and investigate profiteering.
• New homes: Requirement for heat pumps and solar panels in new builds, aimed at reducing long-term fossil fuel dependency.
• Energy security: The Chancellor has announced a plan focused on cracking down on profiteering and accelerating Britain's energy independence.
• Means-tested support: PM Starmer has promised "appropriate" support after the July cap takes effect, with means-tested fuel allowances being developed for winter 2026.

The End Fuel Poverty Coalition has urged the government to prepare emergency energy bill support measures ahead of the July cap increase (End Fuel Poverty Coalition).

Four things to do right now

If you take away four things from this article, make them these:

1. Understand your energy options today. If you are on a standard variable tariff, you are protected at the current cap of £1,641 until July, but the July cap is forecast to rise sharply. Right now, no fixed deal beats the current cap, so fixing is a trade-off between paying slightly more now for certainty versus staying variable and risking a bigger jump in July. Taupia compares the real numbers for your household and monitors the market so you can act when the right deal appears.

2. Budget for higher food and fuel costs. Food inflation could treble by year-end (FDF). Petrol and diesel are unlikely to return to pre-crisis levels for months. Adjust your household budget accordingly, and look for savings on own-brand products, supermarket loyalty schemes, and consolidating journeys.

3. Review all your household bills. The crisis makes the loyalty tax more expensive, not less. When energy, fuel, and food costs are rising, overpaying on broadband and mobile is money you cannot afford to waste. Taupia monitors energy, broadband, and mobile, and switches you when better deals appear.

4. Stay informed - two key dates are coming. The Islamabad negotiations on 10 April and the Ofgem July cap announcement on 27 May will determine whether costs stabilise or rise further. The households that stay on top of the situation and act when the numbers shift will be better positioned than those who do nothing.

What happens next?

The two dates that matter most for UK household finances are:

• 10 April 2026: Islamabad negotiations between the US and Iran (Wikipedia, 2025-2026 Iran-United States negotiations). If talks fail, the ceasefire could collapse and oil prices spike again.
• 27 May 2026: Ofgem announces the July energy price cap (Ofgem). This is when the crisis becomes real on household bills.

Between now and then, the situation remains fluid. The ceasefire has bought time, but mine-clearing in the Strait and infrastructure repairs to Qatar's damaged LNG capacity will take months (Al Jazeera). Oil markets reflect this uncertainty, even with the ceasefire, prices remain significantly above pre-crisis levels.

The UK's structural vulnerability, importing around 44% of its energy, relying on gas for 40% of electricity generation and 85% of home heating, and maintaining only about 10 days of gas storage (House of Commons Library), means Britain is disproportionately exposed compared to most Western economies.

This is not a moment to panic. It is a moment to take practical, measured steps to protect your household budget. The households that understand their options now, weighing the energy fix-vs-variable trade-off, cutting unnecessary bill costs, preparing for higher food and fuel prices, will be significantly better positioned than those who do nothing and wait.