Source: Charlie Stubbs and Alistair Binney, BBC News, “Soaring fuel costs hit small businesses”, published 22 September 2026, reporting RAC Fuel Watch data. Price trend confirmed against the Department for Energy Security and Net Zero's own weekly road fuel prices statistics, updated 21 September 2026.
Our view, before the detail
Twelve days ago we wrote that treating that week's 5p petrol rise as a one-off would be a mistake, because the underlying cause — the US-Israel-Iran conflict disrupting oil supply — hadn't gone anywhere. That turned out to be exactly right, and not in a way anyone wanted. Prices haven't paused or corrected; they've kept climbing at roughly the same pace, and diesel has now crossed a genuinely notable line: the RAC says it's back to where it was when Russia launched its full-scale invasion of Ukraine in February 2022, the last time a geopolitical shock this size hit the pumps.
Our view is that the households most exposed here aren't the ones already worried about fuel — they're the ones who did the sums a fortnight ago, decided the extra cost was manageable, and haven't looked again since. A further 4-5% on top of a rise you'd already absorbed once is the kind of thing that's easy to miss precisely because it doesn't feel like a new shock. It is one.
What's actually moved since our last piece
The RAC told the BBC that diesel is now averaging £1.92 a litre, a level it says is similar to when the Ukraine invasion began in February 2022. That's the headline. The Department for Energy Security and Net Zero's own weekly fuel price data, an independent line to check the trend against, shows the same direction of travel with hard dates attached:
- 7 September: petrol 164.4p, diesel 186.36p.
- 14 September: petrol 168.14p, diesel 190.72p.
- 21 September: petrol 172.01p, diesel 195.53p.
That's a rise of 7.6p a litre on petrol and 9.2p on diesel over two weeks — on top of the single-week 5p jump we covered on 10 September, not instead of it. The cause hasn't changed: the same conflict, still running, oil still trading well above its pre-conflict level, and the RAC's own view two weeks ago — “no sign of any relief yet” — has, if anything, been confirmed rather than proven wrong.
Illustrative 55-litre tank, GOV.UK's own published weekly averages.
- Petrol on 7 September: 164.4p × 55 litres = £90.42 a fill.
- Petrol on 21 September: 172.01p × 55 litres = £94.61 a fill — £4.19 more, in two weeks.
- Diesel on 7 September: 186.36p × 55 litres = £102.50 a fill.
- Diesel on 21 September: 195.53p × 55 litres = £107.54 a fill — £5.04 more, in two weeks.
For a household filling up weekly, that's a further £218 a year on petrol or £262 a year on diesel, purely from the last fortnight's movement — stacking on top of the £143 a year we worked out from the single week before that. Two fortnights, and a family's annual fuel bill has already moved by several hundred pounds against nothing the household changed.
What this looks like for real households, not just a headline number
The BBC spoke to drivers feeling this directly. Susan Parkes, from Telford, called the price “extortionate”: filling up before a family holiday cost her an extra £20, taking the fill to around £120, and she's had to adjust further than fuel alone — “you have to cut your cloth accordingly... where you are used to having a treat, you have got to think about your meals and shopping.” Katie Woollacott, also from Telford, now drives 20 to 30 minutes out of town to find diesel around 20p a litre cheaper, and said a recent fill for her 1.6-litre car came to almost £70 — “definitely a jump” from what she's used to paying. Neither of these are extreme cases; they're ordinary households making the kind of trade-offs a further 4-5% rise actually forces.
A Treasury spokesperson pointed to what government has already done: the extended 5p-a-litre fuel duty cut, which it says keeps diesel 11p a litre cheaper this year than it would have been under the previous government's plans. That's genuine and worth acknowledging — it doesn't touch this fortnight's rise, which comes entirely from the oil price rather than tax, but it means today's number would be higher again without it. It's also the same freeze we flagged in our 10 September piece as scheduled to start unwinding from January 2027 unless extended again at Budget 2026 — that part of the picture is unchanged, and still worth watching separately from whatever the war does next.
What to do this week
- Re-run your real number, not the one from a fortnight ago. If you worked out your weekly fuel cost after our last piece, it's already out of date by roughly £4-5 a tank. Use this week's price for your actual car and mileage before deciding whether anything needs to change.
- Check Fuel Watch again, even if you checked it recently. Katie Woollacott's 20p-a-litre saving by driving further afield shows the gap between forecourts is still worth more than a typical week's rise — the RAC's Fuel Watch page and comparison apps take two minutes.
- If fuel is now genuinely squeezing the weekly shop, treat it as a budget line that's moved, not a one-off to absorb quietly. Our budgeting guide and cut your bills guide help you see where a further £200-260 a year actually needs to come from.
What is still uncertain, and when we will know
Nobody, including the RAC, is claiming to know when this stops. The conflict driving it remains unresolved, and there's no scheduled event — like an inflation reading or a rate decision — that will settle it on a known date. What we can watch reliably is the data: GOV.UK publishes its weekly road fuel prices every Monday, and we'll keep checking it against RAC Fuel Watch rather than assume the trend either continues or reverses. The fuel duty question does have a date attached, separately — Budget 2026, not yet publicly scheduled — and that remains the one to watch for whether the January rise we covered on 10 September actually happens.
Where coaching ends and advice begins. Re-checking your real fuel cost, comparing forecourts, and deciding whether your commute still fits your budget — that's coaching, and it's all covered above. We don't know when oil prices or a Budget decision land, and we wouldn't try to sell you a way to predict either. Buzz Money Coach is a trading style of Buzz Money Ltd, which does not give regulated financial advice and has no product to recommend here. If rising costs are already meaning missed payments or reached-for credit, MoneyHelper, StepChange and National Debtline give free, independent help today, before a squeeze becomes a debt problem.
Two weeks ago the story was a single sharp rise. Now it's a pattern, and patterns are the ones that actually reshape a household budget if nobody checks the number again. Susan Parkes and Katie Woollacott didn't wait to find out the hard way — check yours this week, not from memory.