UK pump prices have risen quickly, but the Competition and Markets Authority's latest explanation is more specific than a simple retailer-margin story. In its report published on 1 May 2026, the CMA said the recent jump was driven mainly by wider cost pressures, especially higher oil prices linked to the Middle East conflict, rather than a broad rise in retailer fuel margins. For households, delivery firms and tradespeople, that does not make a fill-up any cheaper, but it does explain where most of the pressure is coming from. (gov.uk)

The numbers help make that distinction clearer. Petrol prices rose by 26p per litre and diesel by 50p per litre between February and 20 April 2026, yet average retail fuel margins across the market were broadly flat, moving from 10.3ppl in February to 10.7ppl in March, in line with the 2025 average of 10.7ppl. In plain terms, the margin is the gap between what a retailer pays for fuel and what it sells that fuel for. (gov.uk)

That said, the CMA is not giving the sector a clean bill of health. It said a minority of retailers did increase margins in March and that it will investigate further in its next report after receiving the relevant financial data at the end of April. The watchdog also pointed to an earlier spell of higher margins in December 2025 and January 2026, when the market average reached 12.7ppl versus 10.0ppl in November 2025, and repeated that fuel margins remain historically high because competitive pressure in road fuel retailing is still weaker than it should be. (gov.uk)

For motorists, the most useful line in the report may be the simplest one: local price gaps are still wide. The CMA said drivers could save up to £9 on a full tank of petrol or diesel by shopping around, including through apps and websites using Fuel Finder data. That is a meaningful difference for commuters and small businesses alike, and it suggests that routine refuelling habits are still costing some people more than they need to pay. (gov.uk)

Fuel Finder now sits at the centre of the policy response. The CMA says the scheme should make it easier for drivers to compare forecourts, and it expects wider use of third-party apps drawing on that open data to increase competition over time. From 1 May 2026, the regulator also began prioritising enforcement against firms that fail to register or submit accurate, up-to-date prices, with retailers required to report price changes within 30 minutes and warning letters already sent to hundreds of forecourts. (gov.uk)

There is also a point about how the CMA reached these conclusions. Its margin analysis uses confidential revenue, cost and volume data from some of the largest fuel retailers, covering roughly 40% of UK petrol stations, and the May 2026 update says the wider work relies on statutory information-gathering powers under the DMCC Act 2024. That gives the regulator a deeper view than headline pump-price data alone, but it also means the next report matters: April figures should show whether March's retailer-level increases were isolated or the start of something broader. (gov.uk)