Motorists in the UK have faced higher fuel costs since the US-Israel war with Iran began on 28 February.
The conflict has significantly disrupted the production and transportation of energy across the Middle East.
The RAC motoring group has warned. prices at the pump could keep rising if there is no resolution to the conflict.
Crude oil is a key ingredient in petrol. diesel, which means that higher wholesale costs make filling up a car more expensive.
Analysts say every $10 (£7.53) increase in the oil price pushes up pump prices by roughly 7p a litre.
Since the war began. the price of a barrel of Brent crude – the global benchmark for wholesale oil prices – has been very volatile, jumping from $73 to$126 a barrel at one point, the highest since Russia's full-scale invasion of Ukraine.
That put the cost of filling a typical family car with petrol up by around £14. A tank of diesel became £27 more expensive.
The price of petrol reached 158.5p a litre on 19 May, the highest since the war began. Diesel was 185.9p a litre.
The previous high was seen in mid-April, after which prices fell for a time before starting to increase again.
The RAC said it expected unleaded petrol to rise to at least 160p a litre in the coming weeks unless there was a "dramatic. sustained drop" in the price of oil. It thought the outlook was a little better for diesel drivers.
Petrol. diesel prices remain well below the levels reached in the summer of 2022 following Russia's invasion of Ukraine, when petrol reached 191.5p a litre and diesel hit 199p.
Because transporting oil is a slow process. price movements in the wholesale markets take about a fortnight to show at the pump.
Fuel retailers have denied accusations of price gouging during the conflict. The official markets regulator investigated these claims and said that profit margins were "broadly unchanged" between February and March.
Agovernment scheme called Fuel Finderlets drivers compare the cost of fuel offered by petrol stations across the UK.
On 20 May Prime Minister Sir Keir Starmer saida planned 5p increase in fuel duty due in September would be postponeduntil 31 December. of the conflict.
A 5p per litre fuel duty cut was first introduced in 2022, but had been "frozen" ever since. The fuel duty rate on red diesel - used by farmers. rail freight - will also be cut by over a third from 15 June until the end of the year. In addition hauliers will be given "a holiday" for their HGV vehicle excise duty for 12 months.
For the wholesale markets, the most critical issue remains the status of the Strait of Hormuz.
About 20% of the world's oil. liquefied natural gas normally passes through the strait, but it has been effectively closed since the war began.
A ceasefire between the US/Israel. Iran that started on 8 April has largely held, but efforts to strike a long-term peace agreement between the two sides have not been successful. Control of the strait has been a major sticking point.
Analysis by BBC Verify showed. only a handful of ships have passed through the Strait since the conflict began – in normal circumstances around 138 vessels make the crossing every day.
Oil prices fell following the announcement of ceasefire,. have risen sharply in the weeks since as efforts to reopen the strait have failed.
In addition, the conflict has damaged oil and gas facilities across the Gulf, badly disrupting refining capacity.
The investment bank JP Morgan thinks global oil prices are likely to remain above $100 for the rest of the year. even if the current restrictions on the strait are lifted.
The UK is heavily reliant on oil and gas imports, with the majority coming from the US and Norway.
The price of oil on the global market determines how much the UK pays for it.
Although the UK does get some oil from the North Sea, most of that is exported for refining elsewhere.
On 16 April. Chancellor Rachel Reeves said the UK was not facing an immediate shortage of petrol, diesel, or jet fuel.
Oil makes up 35% of the UK's total energy supply, according to the Department for Energy Security and Net Zero. As a member of the International Energy Agency (IEA), the UK must hold 90 days' worth of net oil imports,. currently has more than this.
The IEA has suggested a number of measures to reduce energy. fuel use in response to the conflict, including encouraging staff to work from home or car share.
On the same day as the chancellor's comments, it said Europe had"maybe six weeks of jet fuel left".
European jet fuel prices more than doubled after the war started but are currently about 50% higher.
As a result, several airlines operating in the UK and around the world have cancelled flights and raised their prices.
In response the UK government has announced a series of measures:
In the short term, millions of UK householders' domestic gas. electricity bills are shielded from any impact on wholesale costs paid by suppliers.
People whose energy bills are covered by the price cap saw their unit costs fall in April,. those will not change until the end of June.
However, bills are expected to rise when the next price cap takes effect at the start of July.
Analysts Cornwall Insights have predicted that the cap will go up by £209 to £1,850 a year for a typical dual fuel household. an increase of 13% from the current £1,641 annual bill.
Ofgem is due to confirm the level of the July energy cap on 27 May.
Anyone who already has a fixed energy tariff won't see a price rise for the length of their contract. But some suppliers have been pulling cheaper fixed deals for new customers off the market.
Heating oil is used by many households in Northern Ireland, and in some rural areas. The cost of that fluctuates more directly in response to the oil price. so the latest global uncertainty has pushed up bills for those households refilling their tanks.
The government announced a £53m support package to help those affected.
Additional reporting by Emer Moreau, Kevin Peachey, and Dearbail Jordan
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