Diesel News

This week's diesel market shows marginal movements across the UK's major regions, with the national average holding steady at 148.2p per litre. While the headline figures remain relatively stable, significant regional variations persist — revealing important opportunities for fleet managers looking to optimise fuel spend.

Weekly Price Movement

UK diesel declined by 0.8p from last week, closing at 148.2p/litre. This modest downward movement reflects slight easing in global crude prices following mixed OPEC+ production signals and modest improvements in shipping security through the Red Sea corridor. However, uncertainty remains elevated ahead of next week's EIA crude inventory releases.

The Cheapest and Most Expensive Areas

Best value: North Eastern England and Northern Scotland continue to offer the lowest prices this week, averaging 143.8p/litre. This reflects lower wholesale acquisition costs and less congested distribution networks compared to South Eastern regions. Independent forecourts in these areas are particularly competitive.

Highest prices: London and the South East premium persists at 151.8p/litre — 8.0p above the national average. This reflects higher commercial rents, greater urban demand, and the concentration of branded major forecourts (BP, Shell) in high-cost areas. Owner-drivers in the capital should seriously consider signing up for a fixed-price fuel card to lock in weekly rates.

What's Driving the Changes

Three key factors shaped this week's pricing: (1) Brent crude weakness on better-than-expected US crude inventory draws, pushing oil down to $84.20; (2) Sterling gaining 0.2% against the dollar, which traditionally helps UK pump prices as crude is priced in dollars; and (3) modest easing of refinery constraints at North Sea operations following completion of planned maintenance at Grangemouth.

Week Ahead Outlook

Next week's price action will likely be dominated by American Petroleum Institute inventory data and continued monitoring of shipping security in the Red Sea. Forecasters suggest the national average could move 1–2p in either direction by Friday's close, depending on these signals. We recommend fleet managers check regional breakdowns before scheduling large fuel purchases.

For the first time in over a decade, UK diesel is now consistently 7–8p per litre more expensive than petrol — a reversal of the historical norm where diesel commanded a small discount. This puzzles many fleet operators who remember cheaper diesel as a core advantage. Understanding what's changed is crucial for fuel budgeting decisions.

The Role of Refining Complexity

Diesel requires more complex refining than petrol. The sulphur content must be reduced to ultra-low levels (ULSD — Ultra Low Sulphur Diesel, max 10ppm), and the product must meet strict cold-flow requirements across the UK's varied climate zones. This manufacturing process consumes more energy and requires more advanced distillation infrastructure, adding 3–4p to the cost at the refinery gate before diesel even reaches the forecourt.

Demand from Commercial Vehicles

Fleet demand for diesel is relentless and inelastic. Hauliers and business operators cannot switch to petrol — their vehicles require diesel engines for torque and fuel economy. This creates a demand floor that refinery operators know won't disappear, allowing them to price diesel with higher margins. Petrol, by contrast, faces competition from hybrid and electric vehicles, making the market more price-sensitive.

Taxation Differences

Historically, diesel benefited from a small tax discount (roughly 2p/litre) to support commercial transport. However, HM Revenue & Customs reforms in 2023–2024 narrowed this differential. Coupled with fuel duty being frozen since 2011 in real terms, the government's tax take on diesel has become less favourable relative to global wholesale price movements.

Seasonal and Demand Patterns

Winter months (October–March) see elevated diesel demand as commercial operations peak and heating oil (which uses diesel-spec feedstock) demand increases. Spring and summer demand typically eases, but 2026 has seen sustained commercial demand due to elevated logistics activity ahead of summer haulage season. This seasonal upside pressure on diesel contrasts with more volatile petrol demand tied to leisure driving.

Why This Matters for Fleet Budgets

The diesel premium means two things: (1) fixed-price fuel cards become even more attractive, as locking in a weekly rate provides budget certainty; and (2) fleet electrification business cases have strengthened. Electric vans now cost less per mile when you factor in the 7–8p diesel premium plus no fuel duty, maintenance savings, and government grants.

As we move into Q2 2026, several macroeconomic and seasonal factors will shape diesel prices. Based on current crude oil futures, OPEC+ guidance, and UK refinery utilisation data, we've modelled the most likely price trajectory for spring and summer. Here's what fleet managers should prepare for.

Q2 2026 Seasonal Demand Outlook

Spring marks the beginning of peak commercial haulage season in Northern Europe. Long-distance freight volumes traditionally increase 10–15% from March through May as retailers restock for summer trading and construction activity accelerates. This seasonal demand typically adds 2–3p per litre to diesel prices. For 2026, this upward seasonal pressure is forecast to push the national average toward 150–153p/litre by the end of May.

OPEC+ Production Decisions Impact

OPEC+ meets on 3 April 2026 to review production quotas. Current signals suggest Saudi Arabia and Russia will maintain their voluntary production cuts through Q2, supporting crude in the low-to-mid $80s. If the alliance surprises with deeper cuts (a 5–10% reduction scenario), Brent could spike toward $92–95/barrel, translating to 155–160p diesel at UK pumps. Conversely, if unexpected OPEC+ loosening occurs, crude could drift below $78, bringing UK diesel back toward 145p.

Currency Effects and GBP/USD

The pound has strengthened to 1.2714 against the dollar, benefiting UK fuel prices by roughly 0.5p per litre relative to sterling weakness. However, if the Bank of England pauses rate hikes in Q2 (market consensus suggests a 50% probability), sterling could weaken back toward 1.25, adding 1–1.5p to pump prices independent of crude movements. Currency effects are significant and often overlooked in fleet budgeting.

Refinery Utilisation and UK Supply

North Sea refinery utilisation is forecast at 87–92% through Q2 2026 — healthy levels that support stable supply. No major maintenance shutdowns are scheduled at Grangemouth or Pembroke beyond routine spring works. This suggests supply-side constraints are unlikely to spike prices suddenly. Diesel stocks at UK terminals are tracking 4–5% below the 5-year average, indicating tightness but not crisis conditions.

What Fleet Managers Should Do Now

For businesses with fuel budgets to set: lock in fixed-price fuel cards for April through June now. Weekly prices on most major cards (Allstar, Keyfuels) are already rising into the 149–151p range for early April bookings, reflecting spring upside expectations. Owner-drivers and small fleets should consider 6–8 week fixed-price arrangements rather than weekly spot purchases if cash flow allows. Larger operators should model fuel spend assuming 151–153p as the mid-case for April–June.

If you're a UK business using diesel in commercial vehicles, you may be entitled to claim back VAT on your fuel spend. The rules are different depending on your business structure, and getting them wrong can trigger HMRC compliance issues. Here's the complete guide to fuel VAT reclaim in 2026.

Sole Traders and Self-Employed

If you're a self-employed van driver or sole trader, you can claim VAT back on diesel only if you are VAT-registered. VAT registration is required once your turnover exceeds £85,000, but you can register voluntarily below this threshold. Once registered, you can reclaim VAT on all fuel used in your business vehicles at the standard rate (currently 20%).

Important: you must keep detailed records. HMRC requires fuel receipts, proof of business usage, and a fuel log showing the proportion of business vs. personal mileage. If your van is used partially for private trips, you can only reclaim VAT on the business portion — a common area of error that triggers audits.

Limited Companies

Limited companies have broader VAT reclaim rights. If your company is VAT-registered, you can claim back VAT on all fuel used in business vehicles, including road fuel tax where applicable. The process is the same: fuel invoices go on your VAT return, and you receive the credit within 4–6 weeks of submission.

Company vehicles present no personal use complications (unlike sole trader vans), making VAT administration simpler. However, you'll pay Fuel Scale Charge VAT if the company provides fuel for private mileage — a separate calculation that most accountants handle at year-end.

The Game-Changer: Fuel Cards

Commercial fuel cards like Allstar, Keyfuels, and Fuel Card Services have revolutionised VAT reclaim for small businesses. Rather than collecting individual petrol station receipts, the card provider sends you a consolidated monthly or weekly VAT invoice showing every litre purchased, supplier, date, and cost. This invoice is automatically HMRC-compliant and can be directly entered onto your VAT return.

The benefits are threefold: (1) no manual receipt gathering — fuel card statements are your evidence; (2) reduced audit risk because the card provider's records are audit-proof; and (3) faster VAT processing because consolidated invoices are clearer than hundreds of petrol pump receipts.

Partnerships and Multi-Vehicle Fleets

If you operate a partnership or a fleet with multiple vehicles, VAT reclaim becomes more complex. You must register as a partnership with HMRC and ensure VAT records are maintained for each vehicle or cost centre. Some larger operators use fuel management software that integrates with accounting systems to automate this process.

Common Mistakes to Avoid

Mistake 1: Claiming VAT without being registered. You must be VAT-registered to claim. Below £85,000 turnover, voluntary registration is optional but recommended if you have significant fuel spend.

Mistake 2: Not documenting personal use. HMRC samples audits on fuel claims. If you cannot prove the business percentage of mileage, they may disallow your entire claim.

Mistake 3: Claiming VAT on hybrid vehicles. If your vehicle is eligible for electric charging points or company car tax relief, different rules apply. Consult your accountant.

How to Get Started

Step 1: Confirm VAT registration status with your accountant. Step 2: If not registered, evaluate whether voluntary registration makes sense (it usually does for fuel-heavy businesses). Step 3: Switch to a fuel card — the VAT documentation alone makes this worthwhile. Step 4: Maintain a simple mileage log for personal use to substantiate your business percentage. Most accountants can set this up in under an hour, and the annual VAT savings typically exceed the fuel card costs.

You may have heard references to "red diesel" and "white diesel" in conversations about agricultural and construction operations. These terms refer to two different diesel products with vastly different tax treatments and eligibility rules. Understanding the difference is critical — using the wrong fuel type can result in severe penalties.

What Is Red Diesel?

Red diesel, officially known as "rebated diesel" or "marked fuel," is standard diesel with a red dye added (hence the name). The dye serves one purpose: to make it immediately obvious to HMRC inspectors that the fuel is tax-rebated. Red diesel has excise duty paid at a lower rate than white diesel — approximately 11p per litre versus the standard 57p per litre on white diesel.

This dramatic tax saving makes red diesel much cheaper at the pump. Historically, farmers and construction firms could save 40–45p per litre by using red diesel in off-road equipment. However, regulations have tightened significantly.

Who Can Use Red Diesel After the 2022 Changes?

In March 2022, HM Revenue & Customs implemented significant restrictions on red diesel eligibility. After this date, red diesel can only be used in:

Eligible uses: (1) Agricultural machinery (tractors, harvesters) used on farms; (2) Road maintenance vehicles used by local authorities; (3) Heating oil for non-commercial premises; (4) Certain mineral extraction and quarrying operations; (5) Specific rail and aviation ground equipment.

No longer eligible: Road haulage, general construction vehicles that travel on public roads, waste collection vehicles, and most commercial fleet operations. This change closed significant loopholes that construction firms and small hauliers had previously exploited.

White Diesel Explained

White diesel (also called "standard diesel" or "road diesel") is the standard fuel sold at public forecourts. It contains no dye, carries full excise duty (57p/litre as of March 2026), and is legal for all road vehicles and most commercial applications. This is what your fleet should be using.

The Penalty Risk

HMRC operates a compliance and enforcement program specifically targeting red diesel misuse. Civil penalties range from 30–100% of the duty owed, plus interest compounding at 8.5% per annum. Criminal prosecution is possible in egregious cases, resulting in imprisonment up to five years. HMRC's compliance checks are increasing — inspectors can halt vehicles at roadsides and conduct fuel sampling.

Even innocent misuse carries penalties. If an employee fills up a company van with red diesel at a farm supplier without authorisation, the company remains liable for the penalty.

Practical Guidance for Operators

If your operation includes both on-road and off-road vehicles, implement a fuel management policy: (1) clearly label all vehicles and equipment as either road or off-road; (2) mandate white diesel for all road vehicles; (3) educate drivers and operators about the distinction; (4) maintain records of fuel purchases and which equipment uses which fuel type; (5) conduct quarterly audits of fuel card statements to ensure no anomalies.

Many businesses that once used red diesel in their fleets have switched to white diesel post-2022, absorbing the additional cost as a compliance measure. Given the severity of penalties and HMRC's enforcement focus, this is the safest approach.

UK diesel prices have remained stubbornly elevated through the first quarter of 2026, with the national average sitting at 148.2p per litre — significantly above the 138p seen at the same point in 2024. A key driver behind this persistent premium is ongoing instability across the Middle East, which has added a risk premium to global crude oil benchmarks.

The Red Sea Effect

Disruption to shipping lanes through the Red Sea and Suez Canal has been a significant factor. When tankers are rerouted around the Cape of Good Hope, journey times increase by 10–14 days, adding meaningful cost to every barrel of refined diesel that reaches UK shores. Insurance premiums on vessels transiting conflict-affected waters have also risen sharply, further inflating delivered costs.

OPEC+ Production Decisions

The OPEC+ alliance has maintained production restraint into 2026, with voluntary cuts from Saudi Arabia and Russia continuing to limit global crude supply. This has kept Brent crude in the low-to-mid $80s rather than the sub-$75 levels that were briefly seen in late 2024. Any escalation in regional conflicts — or unexpected production outages — could push crude above $90/barrel, which would translate directly into pump price increases of 5–8p per litre.

What It Means for UK Fleet Operators

For businesses running diesel fleets, the current environment reinforces the case for a fixed-price fuel card. When pump prices are volatile and trending upward, locking in a weekly fixed price through a fleet card provides both cost certainty and protection against sudden price spikes. Cards like Allstar Business Solutions fix their diesel price every Monday — meaning your drivers pay the same rate all week regardless of what happens to Brent crude on Tuesday.

Forecast

Most energy analysts are forecasting UK diesel to remain in the 145–155p range through Q2 2026, barring a major escalation or a significant de-escalation in the Middle East. The spring driving season in the US typically increases demand for refined products, adding seasonal upward pressure from April onwards.

We'll update this analysis every week alongside the BEIS data release. Subscribe to our free alerts below to receive updates directly to your inbox.

You don't need a fleet of 50 HGVs to benefit from a fuel card. The best fleet fuel cards in 2026 are available to businesses with just one vehicle — and the savings can be significant. Here's a complete guide for small fleet operators and owner-drivers.

What Is a Fuel Card and How Does It Work?

A fuel card works like a charge card specifically for fuel. Rather than paying the pump price and keeping paper receipts, your drivers use the card at the forecourt. You receive a single consolidated invoice (usually weekly) with itemised HMRC-compliant VAT receipts for every transaction. Most fleet cards fix their diesel price weekly — typically set every Monday — meaning you know exactly what you'll pay per litre for the entire week, regardless of pump price movements.

Allstar Business Solutions — Best Overall

Allstar remains our top pick for 2026. Their network of over 7,500 accepted sites — covering BP, Shell, Esso, Texaco, and the majority of independents — means your drivers are almost always near an accepted forecourt. The weekly fixed price is typically 2–4p below the national pump average, and automatic VAT invoicing saves significant admin time. Free card, no setup fee, available from 1 vehicle.

Fuel Card Services — Best for Owner-Drivers

Fuel Card Services have built a strong reputation for smaller operators. Their application process is quick (often same-day decisions), they cover good motorway sites, and their online account management is intuitive. If you run 1–3 vans and want a no-fuss card, this is a strong choice.

UK Fuels / Keyfuels — Best for HGV Operators

If you're running lorries or larger vehicles, Keyfuels' coverage of 3,400+ truck-stop sites with high-flow pumps sets them apart. Their integration with tachograph and telematics data is also valuable for compliance-focused operators. AdBlue is available at many sites.

Our Recommendation

For most small fleet operators in 2026, Allstar offers the best combination of network size, pricing, and admin benefits. Apply via our comparison page for a free quote — takes about 2 minutes and there's no obligation.