'Households and businesses across the UK' are under real strain from the latest rise in pump prices, Competition and Markets Authority chief executive Sarah Cardell has said, and that will ring true from Cumbria to South Yorkshire. In plenty of northern communities, the car is not an optional extra. It is how people get to work, get the kids to school and keep small firms moving. In its May 2026 monitoring report, the CMA says motorists could save as much as £9 on a full tank simply by shopping around. For families, tradespeople and delivery drivers doing real miles each week, that is money felt straight away.

The watchdog says the sharp jump in prices since the Middle East crisis has mainly been driven by wider cost pressures, above all higher oil prices, rather than a general decision by retailers to take more margin. Between February and 20 April, petrol rose by 26 pence a litre and diesel by 50 pence. That will be cold comfort to anyone standing at the pump, but it matters. The CMA is drawing a clear line between global shocks and what happens on the forecourt apron, and it says the broad March picture was not one of retailers across the board cashing in.

On the figures, average retail fuel margins were 10.3p per litre in February and 10.7p in March, broadly unchanged and in line with the 2025 average of 10.7p. So while pump prices were climbing fast, the margin story across the market stayed much the same. Even so, the CMA has spotted increases at a minority of retailers. Because it only received the financial information at the end of April, it says it is not yet able to say exactly what drove those rises. That work will continue in its next report, which will also look at April's margin data.

The harder question is what this says about competition. Fuel margins remain above historic levels, the regulator says, and that keeps alive a long-running concern that competition in road fuel retailing is still too weak. The watchdog also points to a spell of higher margins before the current conflict, with December 2025 and January 2026 averaging 12.7p a litre compared with 10.0p in November 2025. For motorists, the takeaway is plain enough: even when price rises are not being driven by a fresh margin grab, the market is still not working as sharply as it should.

For towns and rural routes outside the major city cores, the most striking line in the report may be the sheer gap between one local price and the next. The CMA says significant local variation means drivers can save up to £9 a tank of petrol or diesel if they compare forecourts rather than pulling into the first convenient stop. That is the promise of Fuel Finder, the scheme recommended by the CMA and now introduced by the Government. Third-party apps and websites are already using the data, and the regulator says wider use should make it easier to spot the cheaper pump, put more pressure on dearer sites and help chip away at stubbornly high margins.

The CMA is now moving from encouragement to enforcement. Retailers that fail to register with Fuel Finder, or fail to submit accurate and up-to-date prices, could face fines. Warning letters have already gone to hundreds of forecourts that have not yet signed up. The report draws on confidential sales, costs and volumes data from some of the biggest firms, covering roughly 40 per cent of petrol stations nationwide, which gives it more weight than a basic price survey. For northern readers, the next test is straightforward: if oil costs ease, the saving needs to show up quickly on local forecourts, not drift in weeks later.