The average price of diesel on UK forecourts has now broken through £2 a litre. That is not a motorway-only figure or a one-off spike on a local pole. It is the national average crossing a line drivers have watched coming for months.
Analysis by the RAC Foundation of the government’s Fuel Finder data put the breakthrough at 8am on 1 October 2026. Petrol, by the same reading, was about 174.7p a litre. Earlier in the week the RAC had already recorded an all-time high average of 199.18p for diesel, just above the previous peak of 199.09p set in June 2022.
Official weekly statistics sit just behind that live picture. For the week commencing 28 September 2026, DESNZ weekly road fuel prices put diesel at 197.58p a litre and petrol at 173.46p, with fuel duty still at 52.95p a litre and VAT at 20%. The gap between diesel and petrol is now measured in tens of pence, not pennies.
How the bill is built
Of that £2 diesel litre, the RAC Foundation says about 86p goes to the Treasury in fuel duty and VAT. Duty is the same on petrol and diesel at 52.95p. The premium on diesel is therefore coming from the wholesale market, not from a higher duty rate.
That premium has been building since the Iran war began at the end of February. RAC Fuel Watch figures show diesel up by more than 55p a litre from 142.38p on 28 February, a rise of close to 40%. A typical 55-litre diesel fill-up is running at about £109 to £110. That is roughly £30 to £31 more than at the start of the conflict, according to RAC commentary carried by trade reporting and Fleet World.
Oil has been trading around and above $100 a barrel for weeks, with recent readings near $106. The Strait of Hormuz, which once carried about a fifth of the world’s oil, remains tightly constrained. That keeps crude expensive. It also keeps refined diesel scarce on world markets.
Availability: expensive, not empty
High prices are not the same as empty tanks. The Department for Energy Security and Net Zero told Metro that forecourts are being supplied as normal and that the UK has “a diverse and resilient supply”. Fuel Industry UK said it had not heard of motoring restrictions being weighed.
Community fuel-availability trackers have shown almost no stations reporting dry pumps in early October, with a seven-day average of about 0.01% of sites affected. That matches the official line: the crisis at the moment is cost, not a national shortage.
The government does have a National Emergency Plan for Fuel, last updated in 2024. It includes priority filling for emergency services, commercial distribution rules and a maximum purchase scheme. Officials say it would only be activated if an incident threatened significant and widespread disruption. There is no evidence that rationing is imminent.
Why diesel feels tighter than petrol
Britain’s diesel problem is structural as well as geopolitical. After the closures of Grangemouth and Lindsey, the country is down to four major refineries. Even when all four run, UK production covers only about 45% of diesel demand, according to industry reporting around the current squeeze. The rest is imported.
ExxonMobil’s Fawley refinery in Hampshire, the UK’s largest, is in a planned maintenance shutdown of up to about 10 weeks into late autumn. Fawley accounts for around a fifth of UK road fuel. The company has said the work is needed for safe and reliable operations and is making up lost output with imports through its terminal. That keeps product available. It also leaves pump prices more exposed to expensive cargoes from abroad.
Press reports this week say Britain has been in talks with European allies about tapping diesel stockpiles, against a backdrop of US export-policy threats and already-tight global diesel balances. The UK’s own diesel reserves are measured in weeks rather than many months. That does not mean pumps run dry tomorrow. It does mean a further external shock would be felt quickly.
What it means for the taxi trade
Taxi and private hire work turns fuel into miles more relentlessly than almost any other road use. A full-time driver covering 30,000 to 40,000 miles a year in a diesel vehicle using around 30 miles per gallon will burn roughly 4,500 to 6,000 litres a year.
trade reporting put that into cash terms after March’s record monthly diesel jump of about 40p a litre: roughly £1,800 a year extra at 30,000 miles, and about £2,400 at 40,000 miles. The rise since late February is now larger still. At around 55p to 58p a litre above the pre-war average, the same mileage bands imply well over £2,000 a year in additional diesel cost for many working drivers, before insurance, licensing, maintenance or finance.
Hackney fares are set by local authorities and move slowly. Private hire pricing is more flexible but still constrained by apps, competition and passenger resistance. In both cases, fuel can jump in days while the fare that recovers it can take weeks or months.
Local authorities are already treating diesel as a live policy variable. Sheffield licensing papers for June 2026 set out a temporary, variable hackney fuel surcharge linked to average diesel prices, rising in 20p steps from £0.20 once diesel exceeds 165p a litre to £2.00 once it exceeds 210p, with monthly reviews against DESNZ data. Stevenage has consulted on a simpler 40p per journey fuel surcharge once the UK average diesel price reaches £1.79 a litre on the same government series, with zero and ultra-low emission vehicles exempt.
Those are real-world examples of the trade asking councils to keep meters honest with the forecourt. They also show how uneven the response is. One town may add a fuel line to the fare card. Another may wait for a full tariff review. Drivers working across boundaries feel that gap directly.
Who wants what from government
Fuel duty remains at 52.95p a litre until 31 December 2026 under the amended HMRC rates. That extends the temporary 5p cut first introduced in March 2022. Unless Budget 2026 changes course, the legislative default is for diesel duty to rise to 55.95p on 1 January 2027 and 57.95p on 1 March 2027.
The Autumn Budget is due on 28 October 2026. That is now the main political event for pump prices.
Logistics UK says filling an HGV has risen from around £750 to over £1,000 during the crisis and wants the 5p cut kept into next year. The Road Haulage Association is pressing the Chancellor to scrap the planned duty rises and consider an essential-user rebate, arguing that a fuel duty hike becomes a food price hike because almost everything on supermarket shelves arrives by lorry. FairFuelUK wants an emergency 10p cut now, not after the Budget, and cites thousands of forecourts already showing £2.05 to £2.18.
The government position, set out when the 5p cut was extended in May, is that it is already holding duty at its lowest rate for more than 16 years and that the Iran war is the driver of pump prices. Treasury messaging has stressed protection at the pump without a knee-jerk change to wider fiscal policy.
What is likely next
Three near-term paths matter more than forecasts dressed up as certainty.
First, wholesale diesel. Unless crude falls and stays down for weeks, and unless refined diesel supply eases, the RAC’s working assumption is that pump prices stay high. Analysts quoted by campaign groups have even floated £2.20 to £2.25 if wholesale keeps climbing. That is a scenario, not a government forecast, but it shows how little room there is above the new £2 average before more pain arrives.
Second, Budget politics. The least dramatic outcome is another freeze or a further short extension of the 5p cut. A deeper cut would take money off every litre immediately, including for taxi and private hire drivers. Letting the published January and March rises stand would add several pence more just as winter heating and HGV demand usually tighten diesel markets further.
Third, physical supply. Fawley’s return from maintenance should ease one domestic pressure later in the autumn. A sudden US export restriction, a fresh Middle East shock, or a run on European stocks would do the opposite. DESNZ still says supplies are resilient. The trade should treat that as today’s position, not a guarantee for every week through winter.
For taxi and private hire operators, the practical outlook is therefore blunt. Diesel is likely to remain expensive through the Budget and into early winter. Availability looks manageable on current evidence, but import dependence means price volatility is now the normal risk, not the exception. Drivers on regulated meters will keep pressing for surcharge or fare reviews. Drivers on apps will keep absorbing cost until pricing power allows a pass-through. Fleets already moving to hybrid or electric will find the arithmetic easier to defend. Those still dependent on diesel will need every litre of margin they can find.
The £2 litre is a psychological marker. For the taxi trade it is also an operating fact: fuel has become the fastest-moving cost in the business, and the mechanisms that recover it still move at licensing speed.