The US-Israeli war with Iran is already filtering into UK household finances. The first effects are showing up at the petrol station and in the mortgage market, while the bigger risks depend on how long the conflict lasts and whether energy supply routes remain disrupted.
For now, the impact is uneven. Some costs move quickly, like fuel. Others move with a lag, like regulated household energy bills. But the common thread is uncertainty, and that uncertainty is pushing up wholesale prices and the cost of funding for lenders and suppliers.
Fuel Prices Are Moving First
Drivers are seeing the most immediate changes. By Sunday, average petrol prices had risen by 4.68p to 137.51p per litre, while diesel had increased by 8.59p to 150.97p per litre, according to the RAC.
Analysts often estimate that every $10 rise in crude oil adds about 7p per litre to pump prices. With crude up sharply since the conflict began, average petrol above 140p per litre is now widely expected. If oil stays elevated, diesel could remain above 150p and climb further.
Higher fuel does not stop at the forecourt. Transport costs can lift prices across the economy, including supermarket logistics and other services that rely on road freight.
Mortgage Rates and Product Choice Are Tightening
Before the conflict, markets were leaning toward gradually lower borrowing costs. Since the war began, the tone has shifted. Some major UK lenders have raised mortgage pricing, reflecting higher funding costs and a reduced expectation of near-term base-rate cuts.
Rates have not spiked dramatically yet, but they have moved higher. As of 9 March, Moneyfacts data shows the average two-year fixed mortgage at 4.87% and the average five-year fixed at 4.98%. Both being near 5% matters psychologically, and it changes affordability calculations for borrowers refinancing or buying.
Choice can shrink during volatile periods. Some lenders have already pulled ranges to reprice, which can reduce competition and nudge rates higher, particularly for shorter-term deals.
Energy Bills Have a Delay, Heating Oil Does Not
For households on standard variable tariffs in England, Wales, and Scotland, the Ofgem price cap provides short-term insulation. The cap level is set through July, and bills are due to fall in April under the already-announced cap change.
But the next cap, which will shape bills from summer, depends on wholesale market pricing between now and late spring. If wholesale gas prices stay high for several weeks, it could feed into a higher cap later in the year. Previous spikes have forced government intervention, and that risk rises if elevated prices persist.
Fixed energy deals are reacting in a similar way to mortgages. Some suppliers have withdrawn fixed tariffs or repriced them higher, and longer-duration deals can become rarer when wholesale markets are unstable.
The sharpest and least protected exposure is heating oil, which is not covered by the price cap. Campaigners report rapid price increases and tighter ordering conditions driven by a mix of supply stress and panic buying. Regulators have signaled they expect clear pricing and fair terms, particularly for customers who have already placed orders at an agreed price.
Inflation and Bank Rate: Less Room for Cuts
Higher energy costs can quickly complicate the inflation outlook. UK inflation forecasts produced before the conflict assumed a relatively stable path toward the 2% target over time. That assumption is now under pressure, because oil and gas feed into transport, heating, and business costs.
Analysts generally do not expect a repeat of the 11.1% inflation peak seen in October 2022, when the Ukraine war also drove food commodity shocks. Still, a sustained rise in energy prices could keep inflation stickier than hoped.
That, in turn, makes interest-rate cuts less likely in the near term. Expectations for an imminent cut have faded, and the Bank of England may have to balance weak growth against the risk that energy-driven price increases linger.
Travel and “The Price of Fun”
Air travel is another pressure point. Jet fuel costs have risen, and while airlines often hedge fuel purchases, prolonged higher input prices typically make their way into ticket prices over time. If disruption to airspace and routing persists, costs can rise further through longer flight paths and operational complexity.
How far these effects go will depend on whether the conflict de-escalates quickly or turns into a longer period of disrupted supply lines. For UK households, the next few weeks are likely to set the tone for summer energy bills, borrowing costs, and broader price pressures.