On 28 February 2026, US and Israeli forces struck Iran. Within 72 hours, QatarEnergy declared force majeure. Within five days, Nationwide, HSBC, and NatWest raised mortgage rates. Within a week, petrol had climbed from 132.8p to 137.51p per litre.
None of this is coincidence. The Strait of Hormuz — a waterway most Britons couldn't locate on a map — is now dictating the cost of filling a car, heating a home, and refinancing a mortgage in the UK. The transmission from Middle Eastern conflict to British household budgets is faster, wider, and more damaging than most people realise.
What Changed
The underlying vulnerability is straightforward: the UK is a price-taker in global energy markets. The British government acknowledged this explicitly in a March 7 factsheet, stating that oil and gas prices are "determined by international markets" with no unilateral UK mechanism to control them.
Roughly 20% of the world's oil and LNG transits the Strait of Hormuz, per the IEA. Iran's effective closure of that waterway has removed millions of barrels per day from the global supply chain — and UK energy markets felt it within days.
The immediate data:
- UK April 2026 wholesale gas prices: up 52% in under a week — from 78.6p/therm (February 27) to 119.5p/therm by March 4
- Day-ahead power prices: up 30%, from £76 to £99.25 per MWh
- Brent crude: climbed 13% on the first day of strikes alone, briefly touching $118/barrel
- Diesel: rose from 142.38p to 150.97p/litre between February 28 and March 8, per RAC Fuel Watch
How the Conflict Reaches Your Wallet — Six Channels
The Iran war isn't hitting UK finances through one mechanism. It's six simultaneous pressure points:
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Fuel at the forecourt. Petrol from 132.8p to 137.51p/litre in 8 days — a 3.5% jump. At $100/barrel, ECIU modelling puts petrol at 150p; at $120/barrel (Rystad's four-month conflict scenario), it reaches 170p.
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Energy bills. The Ofgem cap protects until 1 July. But Cornwall Insight revised its July–September cap estimate upward to £1,801/year — £160 higher than April's cap — solely on the gas spike since the war began.
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Mortgage rates. Nationwide, HSBC, NatWest, Coventry, and Co-Op Bank all raised fixed rates within days. The average two-year fixed now sits at 4.84% per Moneyfacts. Futures markets have moved from pricing near-certain BoE cuts to pricing a 70% probability of a rate rise before year-end, per Morningstar.
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Food prices. The Food Policy Institute warned of long-term food price increases. Transport fuel is an input cost for virtually every supply chain.
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Stock exposure. Shell and BP shares rose; the FTSE 100 dipped several percentage points. Asian contagion signals broader investor unease.
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Rate cut expectations destroyed. Before the war, markets priced an 80% probability of a March BoE cut. That's gone. JPMorgan now says the next realistic cut window is April — conditional on de-escalation.
How Much More You'll Pay
Annual cost scenarios by oil price level:
| Scenario | Oil price | Extra petrol cost/driver/yr | Extra energy bill |
|---|---|---|---|
| Moderate | ~$100/barrel | ~£140 | +£160 (Jul cap) |
| Adverse | ~$120/barrel | ~£320 | +£300–500 est. |
| Severe | ~$135/barrel | ~£440+ | +£500 (Resolution Fdn) |
For the 1.8 million UK households rolling off five-year fixed mortgage deals in 2026, the BoE freeze matters most. Each quarter the Bank holds rather than cuts adds roughly £80–120 per month to a typical £250,000 two-year fix compared to the rate path markets had priced two weeks ago.
EV drivers are almost entirely insulated from the petrol shock. ECIU data shows they already save £870/year over petrol car owners — a gap that widens as crude climbs.
3 Things to Review This Week
Act on these now, before the July Ofgem cap review lands:
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Check your energy tariff end date against the July 1 cap reset. If you're on a variable tariff, the April cap is already set. The July cap — now projected at £1,801 — is live exposure to whatever wholesale gas does between now and then. If your fixed deal expires before October, get a comparison quote from Octopus, EDF, or British Gas this week. Rates may rise further before you act.
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Review your mortgage rate type and renewal date. If you're on a tracker or variable rate, a 0.25% BoE hike that's now priced at 70% probability would add roughly £25–35/month per £100,000 of mortgage. If you're remortgaging within the next 6 months, locking in now — even at today's slightly elevated fixed rates — may cost less than waiting for rates to rise further. Get a broker call booked, not just an online quote.
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Watch the Hormuz shipping data, not just oil headlines. The price at your forecourt, on your energy bill, and in your mortgage rate are all downstream of one variable: whether tanker traffic through the Strait is moving. Track Kpler's vessel data or Bloomberg's LNG tracker — these update daily and reflect the actual physical situation, not just geopolitical commentary. When tanker transits resume meaningfully, that's the signal that relief is coming.
This analysis is for informational purposes only and does not constitute financial advice. Always consult a qualified financial advisor before making investment decisions.
