UK Fuel Retailers Too Slow to Pass On Price Cuts, Says CMA

The UK Competition and Markets Authority (CMA) has raised concerns over what it calls 'passive pricing strategies' used by most fuel retailers, which it said are helping to keep profit margins high. The findings appeared in the watchdog's August 2026 quarterly fuel-market update, published on 18 August 2026. The CMA found that some retailers did not promptly pass on falls in wholesale diesel prices to drivers between May and June 2026. The Guardian

'Passive pricing' refers to a pattern where retailers are slow to cut pump prices when their own costs fall, but quick to raise them when costs rise. The result is that profit margins — the gap between what retailers pay for fuel and what they charge drivers — stay elevated even as market conditions shift. Fuel pump costs overall did fall in June 2026, but the CMA noted that prices remained significantly higher than before the Middle East conflict. Retailer profit margins stayed at or above historically high 2025 levels. The CMA said it found no evidence of profiteering among fuel retailers on the back of the war in Iran. The Guardian

CMA chief executive Sarah Cardell said the watchdog would continue to monitor fuel prices and margins closely and expected reductions in wholesale prices to be rapidly and fully passed on to drivers. The CMA said it would carry out a more detailed review of the UK road fuel market in autumn 2026. The Guardian

The update also covered compliance with the government-run FuelFinder price comparison scheme, which lets drivers compare fuel prices at nearby stations. The CMA said it had sent 1,166 warning letters to fuel retailers since April 2026 about failure to register with the scheme, alongside 53 compliance notices. About 97% of UK petrol stations are registered with FuelFinder, accounting for approximately 99% of the fuel sold in the UK. The CMA had not yet issued any fines over FuelFinder non-compliance as of its August 2026 update. The scheme is run by the UK government and the technology company VE3. The Guardian

FuelFinder was created on the back of a CMA recommendation in July 2023, after the watchdog found competition among fuel retailers had weakened since 2019. That earlier investigation found drivers were paying nearly £1bn more for fuel at supermarkets during the previous year because of increased margins. The CMA published a monitoring update on 1 June 2026 assessing the impact of the Middle East conflict on fuel prices and margins up to the end of April 2026. The Guardian

Motoring groups echoed the CMA's concerns. The AA said the update highlighted failures by some fuel retailers to charge a fair price for petrol and diesel. AA president Edmund King said many more retailers, including large numbers of supermarkets, were not passing on lower costs promptly. RAC head of policy Simon Williams said it was very concerning that fuel margins remained historically high and competition was still lacking, and welcomed the CMA's closer look at retailer pricing strategies. The Guardian

The domestic picture sits against a tighter global supply backdrop. Reuters reported on 10 August 2026 that U.S. and European diesel prices rose sharply, with the U.S. ultra-low sulfur diesel futures contract rising 7.4% to settle at $4.19 a gallon. Reuters

The broader context here is the CMA's careful distinction between coordinated profiteering and structural 'passive pricing.' The watchdog has explicitly cleared retailers of war-related profiteering, yet it maintains that majority pricing behavior sustains margins above historical norms. This framing places the burden on competitive dynamics rather than intentional misconduct, and the autumn 2026 review will test whether deeper regulatory intervention is warranted or whether existing transparency tools like FuelFinder are sufficient to discipline the market. The high compliance rate with FuelFinder, covering 99% of fuel sold, suggests the transparency infrastructure is functionally embedded, yet margins remain stubborn. That tension between transparency and pricing outcomes is the central question the CMA's autumn review will need to resolve.