Britain’s new-car market recorded its strongest September in almost a decade, with registrations rising 12% from a year earlier as demand for battery-electric vehicles accelerated amid higher fuel costs and growing uncertainty over diesel supplies.

Preliminary figures from the Society of Motor Manufacturers and Traders showed 350,518 new cars were registered in September, the highest total for the month since 2017. Electric vehicles were the main source of growth. Battery-electric vehicle registrations increased 36% year on year to 99,199 units, giving them a 28.3% share of the market.

The sharp increase came as consumers across Europe reassessed the cost of conventional vehicles following disruptions in global energy markets. Higher fuel prices, driven in part by oil-market shocks linked to the war involving Iran, have strengthened the economic case for vehicles that do not depend on petrol or diesel.

The shift is particularly visible in Britain’s changing fuel mix. Petrol registrations declined 6.7% in September, while hybrid-electric vehicle registrations fell 4.2%. Diesel registrations, meanwhile, increased 11.5% during the month, although the rise did little to reverse the fuel’s longer-term decline. Diesel registrations were down 7% during the first nine months of 2026, leaving diesel with only about 4.5% of the market.

Petrol remained the dominant fuel type, accounting for 41.5% of registrations during the first nine months of the year.

The data point to a market being reshaped by both consumer economics and supply-chain uncertainty. The latest disruption to diesel markets has come as the United States and Russia have affected global availability, while the prospect of further restrictions on U.S. diesel exports has added another layer of uncertainty for European consumers and manufacturers.

EV Growth Still Falls Short of UK Target

Despite the rapid September increase, Britain’s electric-vehicle market remains below the government’s target for 2026.

Battery-electric vehicles accounted for 26.2% of new-car sales during the first nine months of the year, compared with a 33% target for 2026. The figure is also below the 28% target that had been set for 2025.

That gap points to the challenge facing the government and automakers as Britain attempts to accelerate the transition away from internal-combustion engines. The UK is reviewing its zero-emission vehicle targets in an effort to ease pressure on manufacturers. Carmakers face increasingly demanding requirements to raise the proportion of zero-emission vehicles in their sales mix, while weak demand in some segments has made the transition more difficult.

The industry is also facing a potentially important trade challenge from the European Union. Proposed “Made in Europe” provisions could restrict access to incentives for British-built vehicles and exclude them from EU public procurement, creating another competitive disadvantage for manufacturers operating in the UK.

For Britain’s auto industry, therefore, the EV transition has gone beyond persuading consumers to switch technologies. Manufacturers must simultaneously manage regulatory targets, changing trade rules, supply chains and competition from aggressive Chinese brands.

That competition is becoming particularly visible in the UK market.

Chinese Brands Gain Ground

Chery’s Jaecoo 7 was the UK’s best-selling car in September, according to SMMT data, marking a notable breakthrough for a Chinese automotive group in one of Europe’s most mature vehicle markets. BYD, another major Chinese manufacturer, also performed strongly. Its Sealion 7 was the best-selling battery-electric model after Tesla’s Model 3 and Model Y.

The results illustrate how China’s automotive industry is expanding beyond its domestic market at a time when European manufacturers are under pressure to deliver affordable EVs while maintaining margins.

Chinese automakers have been competing on a combination of price, technology, and vehicle specifications, giving consumers more alternatives as governments push the market toward electrification.

For established European manufacturers, the combination yields a difficult competitive equation. They must invest heavily in electric platforms and comply with stringent emissions requirements while competing with companies that have rapidly expanded their EV manufacturing and supply chains.

The September figures also show why the headline growth in EV sales needs to be viewed alongside the industry’s broader targets. A 36% annual increase in battery-EV registrations is substantial, but the market still needs to accelerate further if the 2026 target of 33% is to be reached.

Fuel-market disruption could provide an additional push. If petrol and diesel prices remain elevated because of geopolitical shocks or supply constraints, the running-cost advantage of EVs could become more important to consumers. But the effect is unlikely to be uniform, particularly for buyers who remain sensitive to vehicle prices, charging infrastructure and access to affordable financing.

Therefore, the UK market is moving more quickly toward electric vehicles, but the September surge does not resolve the structural challenges facing the industry. Manufacturers still have to close the gap between current EV adoption and regulatory targets while dealing with trade uncertainty and intensifying competition from Chinese brands.

The result is an increasingly fragmented market in which fuel prices, geopolitics, government regulation, and technology are all influencing purchasing decisions.

OPEC+ has delayed a review of members’ oil production capacity that will help determine their 2027 output quotas, after the U.S.-Israeli war on Iran disrupted projects intended to expand production across the Middle East and clouded estimates of future supply, two sources familiar with the matter told Reuters.

The review was originally scheduled for completion by the end of September 2026. The deadline has now slipped to mid-November, the sources said, potentially leaving OPEC+ with only a short window to assess the findings before its next group-wide meeting later that month.

The delay highlights how the conflict has complicated one of the oil alliance’s most politically sensitive exercises. Production-capacity estimates are not simply technical measurements. They can determine how much crude individual members are permitted to produce, making changes to the assessment a potential source of tension among countries competing for larger shares of the group’s output.

OPEC+ includes the Organization of the Petroleum Exporting Countries and allies, including Russia. The alliance ordered the capacity review in late 2025 ahead of setting production baselines for 2027.

At its most recent group-wide meeting in June, OPEC reaffirmed “the importance of completing the maximum sustainable production capacity (MSC) assessment for all (member) countries to be used as reference for 2027 production baselines.”

The review is intended to provide an independent assessment of the maximum amount of oil each member can sustainably produce. But determining that figure has become more difficult as the conflict has delayed projects designed to add new production capacity in parts of the Middle East.

The two sources said not all OPEC+ members had yet submitted the information required for the assessment, without identifying the countries involved.

U.S. petroleum consultant DeGolyer and MacNaughton is conducting the review for OPEC+ members except Russia, Iran and Venezuela, which are under U.S. sanctions, according to sources who spoke to Reuters in late 2025.

The consultancy is now expected to submit its report to OPEC by mid-November, the sources said. That would give the organization time to consider the findings before the next group-wide meeting expected in late November.

Russian Deputy Prime Minister Alexander Novak was reported by state news agency TASS on Friday as saying that OPEC+ countries were continuing to assess their maximum production capacities.

The timing of the review matters because capacity additions that were expected to be completed before the assessment may no longer be available on the original timetable. Projects delayed by the conflict could therefore alter the amount of production capacity that consultants and OPEC+ officials consider sustainable for 2027.

The uncertainty also comes at a time when the oil market is already dealing with disruptions to crude flows and refining operations across the region. For OPEC+, however, the immediate issue is not simply how much oil is unavailable today, but how the conflict changes assumptions about future supply.

A producer that was expected to add substantial capacity could receive a different assessment if its expansion is delayed. Conversely, a member that has successfully completed capacity additions could argue that its production baseline should rise.

Quotas Could Become A New Source of Tension

The capacity assessment is considered necessary because OPEC+ quotas are negotiated against the backdrop of competing interests among members.

Countries with lower assessed capacity could face pressure to accept lower future production allocations, while producers that have expanded their ability to pump crude could seek higher quotas. The review therefore provides a technical basis for what can ultimately become a political negotiation.

The United Arab Emirates had been one of the strongest advocates for increasing its OPEC+ quota to reflect rising production capacity before it left the alliance in May. But Iraq is also seeking a higher quota and has considered leaving OPEC, sources told Reuters in June.

Those disputes explain why the delayed assessment could have consequences beyond the timetable itself. If the review produces materially different estimates of sustainable capacity, it could reopen arguments over how production should be distributed among members.

OPEC+’s challenge is to distinguish between temporary disruptions and lasting changes to productive capacity. A project delayed by war does not necessarily mean the underlying reserves or infrastructure have disappeared. But if construction, equipment deliveries, or other expansion work remains disrupted, the additional barrels may not be available when the new production baselines take effect.

The backdrop has created a moving target for the consultants conducting the assessment and for OPEC+ officials who will eventually use it in quota negotiations. The delay also gives producers additional time to provide updated information as the situation develops. But it could leave the alliance confronting a more complicated decision at its November meeting, when members must consider both the assessment and the wider outlook for oil demand, supply and geopolitical risk.

For the oil market, the significance lies in the potential gap between nominal production capacity and barrels that can actually be brought to market. OPEC+ has traditionally relied on spare capacity as a buffer against supply disruptions, but the value of that buffer depends on how quickly producers can access and sustain those barrels.

The delayed review indicates that even before OPEC+ settles its 2027 quotas, the conflict has already changed the assumptions on which those quotas are being built.