TL;DR: The UK's competition watchdog is probing fuel retailers for potential 'profiteering' as diesel prices soar by 16p a litre in just two weeks. The investigation follows a spike in wholesale oil costs linked to recent conflict in the Middle East, with the CMA warning against unfair price hikes for drivers.
Key Facts
- 16p: The price rise for a litre of diesel in the UK over the past fortnight, with petrol climbing by 7p.
- CMA: The Competition and Markets Authority has warned retailers against unfair price hikes and is now demanding transparent sales data.
- $100: The price per barrel for wholesale oil recently smashed through this barrier twice in a single week following the conflict.
- 11.1%: The total percentage increase in UK diesel costs since the conflict began in March 2026, according to RAC figures.
UK fuel prices surge 16p: watchdog demands action
The UK’s competition watchdog has fired a stern warning shot at fuel retailers, putting them on notice over potential UK fuel price profiteering. The move comes as drivers face yet another painful squeeze at the pumps, with the price of diesel shooting up by a staggering 16p per litre in just two weeks.
The Competition and Markets Authority (CMA) has confirmed it is closely monitoring the market after the recent flare-up between the US and Iran sent wholesale costs spiralling. For UK drivers, the impact was immediate and severe.
What this fuel price u-turn means for UK drivers
According to the latest data from the RAC, the reality on the ground is stark. Since the conflict kicked off in March 2026, diesel prices have surged by 11.1%, while petrol costs have jumped 5.5%. These petrol and diesel price increases UK-wide are a direct hit to household budgets.
The watchdog is now hunting for evidence of 'rocket and feather' pricing to keep the industry honest. This isn't just a headline; it's a real hit to the wallet. High fuel costs don't just hurt when you fill up; they push up inflation across the board, which could prevent the Bank of England from lowering interest rates. It feels like a double whammy for families.
Why UK petrol & diesel prices are rising so fast
It’s easy to point the finger at the global energy market, and that is a massive factor. Wholesale fuel costs Iran war tensions have pushed oil past the $100 (£75) a barrel mark twice in a single week. This followed Iranian strikes on key energy hubs and threats to shut down the critical Strait of Hormuz shipping lane.
But is that the whole story? Chancellor Rachel Reeves doesn't think so. She has made it clear that the government will not stand by while companies use a global crisis to pad their profit margins. This sentiment is at the heart of the CMA fuel industry review.
Exposing 'rocket & feather' fuel pricing tactics
I've seen this pattern before, and it’s what experts call rocket and feather pricing. It’s the frustrating cycle where pump prices skyrocket the second wholesale costs tick up, yet seem to drift down like a feather once those costs eventually drop.
Juliette Enser, a senior director at the CMA, noted that while some price increases linked to wholesale fuel costs are unavoidable, they should not be an excuse for opportunistic gains. To get to the bottom of it, the watchdog has demanded that firms hand over transparent sales and revenue data. This will allow them to map out actual profit margins and spot unfair markups.
How UK drivers can respond to rising fuel costs now
While we wait for the official UK fuel finder scheme to become fully effective, many retailers are still dragging their feet on sharing live data, drivers are left in a tough spot. The good news is you can still be proactive.
This might be the time to look at ways to make a tank of fuel last longer or even ask if running a diesel car is still worth it given the current price volatility compared to petrol. The pressure is mounting, with Ed Miliband and the Chancellor set to haul industry bosses in for a meeting soon. Until then, however, the burden falls on drivers to watch the pennies and shop around for the best price possible.
