Is diesel rationing coming to the UK, and is there a 50mph plan?

What is being shared

The headlines behind the past few days’ searches for “diesel rationing” include “Who gets first priority for diesel rationing confirmed by government” (Daily Express, 26 September 2026), “Diesel rationing and 50mph speed limit plans could return as prices hit record high” (Brit Brief, 27 September), “Diesel rationing and new 50mph speed limit plan on table for all of UK” (Daily Express, 27 September) and “Government confirms who gets first priority on fuel as rationing and 50mph speed limit proposed” (LADbible, 28 September). On 28 September the Express added “Drivers with diesel cars issued ‘42-day’ warning”.

They came as diesel approached, then passed, its all-time high: the RAC’s UK average, published on the morning of 28 September, was 199.18p a litre, above the 199.09p record of 25 June 2022. Two things are being joined: a real price record, and an emergency plan that ministers say has been in place for over a decade, whose rationing measures have not been switched on and whose published summary says nothing about 50mph.

What the emergency plan actually says

The rationing tools sit in the National Emergency Plan for Fuel, produced by the Department for Energy Security and Net Zero (DESNZ). Only a summary is published: the GOV.UK page, last updated on 16 April 2024, lists ten tools. Five help industry keep fuel moving, including reserve tankers, military tanker drivers and the release of emergency oil stocks. Some of these have been used: a competition-law exemption for the fuel industry in September 2021, and emergency stocks when the UK joined the International Energy Agency’s collective release in March 2026. The other five control the supply of and demand for fuel, and “would only be activated in the event of a severe national fuel supply shortage”.

Those five are what the headlines call rationing: priority filling stations for emergency and critical service vehicles; bulk fuel directed first to critical services such as emergency services, utilities and public transport; road diesel prioritised for commercial vehicles on supply chains such as food and health; formal allocation of crude and imported products; and a Maximum Purchase Scheme capping what the public can buy per visit, possibly with shorter selling hours. The summary gives no figure for the cap; Cabinet Office guidance from November 2008 gave 15 litres, “though this is variable”. GOV.UK says the emergency powers behind these measures are “reserved for the most severe of disruptions”, with “a preference for the least invasive measure first”. This is the priority list the “confirmed by government” headlines describe; the GOV.UK summary has not been updated since April 2024, and none of the five has been activated.

Where the 50mph limit comes from

The GOV.UK summary contains no speed limit, and we found no government statement or parliamentary answer this year proposing one. LADbible wrote that the plan shows “a temporary speed limit reduction to 50mph” (28 September); the published summary does not. Brit Brief and LBC trace the 50mph line to ITV’s political correspondent Louisa James, who said on Good Morning Britain in March 2026, six months before these headlines, that the published plans included rationing and priority fuel, and “also reportedly, a temporary 50mph speed limit to reduce demand for fuel” (as quoted by LBC, 28 September). LBC also reported on 28 September that DESNZ had denied reports that a speed limit could be introduced or fuel purchases rationed.

The precedent is from the 1970s, when there was a 10% cut in oil supplies and queues at the pumps. On 5 December 1973 the Secretary of State for Trade and Industry, Peter Walker, told the Commons: “A 50 mph speed limit will be imposed by order on all roads, including motorways, except where a lower limit already applies.” It was lifted on motorways at the end of March 1974 and on other roads in May; from December 1974 a 50mph limit applied again on single-carriageway roads, as an energy-saving measure, until the limits were revised in 1977. Ration books were issued from 29 November 1973 as a precaution; rationing was never brought in, and in July 1975 motorists were told they could destroy them (Hansard; RAC Foundation, 2009). The nearest thing this year is advice to governments, not a UK plan: on 20 March the International Energy Agency listed “Reduce speed limits on highways by at least 10 km/h” among ten ways to cut oil use.

Is there a shortage?

Not on the evidence published. Asked in the Lords on 28 April 2026 what plans the government had to activate the plan, Lord Whitehead, a DESNZ minister, said “the physical supply of fuel to the UK is stable”, called it “a plan that we are not intending to implement at the moment because the circumstances envisaged by that emergency plan are not in place”, and added that it “is a plan for shortages of fuels, of which there are none at the moment in the UK”. That answer is five months old. On 27 and 28 September a DESNZ spokesperson gave reporters, including LBC, the same line: “We have a diverse and resilient supply. We continue to engage with our international partners and the UK fuel industry.” LBC reported that DESNZ says forecourts are being supplied with diesel as usual.

The official stock figures are published two months in arrears, and the newest one moves the other way. DESNZ figures published on the morning of 29 September put UK stocks of white diesel, the grade sold at the pumps, at about 1.02 million tonnes at the end of July 2026, 13% less than a year earlier and 13% less than at the end of June (provisional). That is the lowest since December 2023, though above the lows of late 2022. Total UK oil stocks were 9.6 million tonnes, 10.3% less than a year earlier, mostly because less was held abroad after the March release; stocks held in the UK were 1.6% lower. The International Energy Agency’s figures, as reported by DESNZ, put the UK at 117 days of net imports across all oil in June, against the 90-day requirement, and DESNZ says “the UK remains well-supplied for all oil types from a diverse range of sources” (Energy Trends Table 3.11, 29 September 2026).

The “42 days” comes from Sky News. Its Ed Conway said the UK was “barely more at 42 days worth of imports in terms of our emergency stockpiles” of diesel, against 31 for Australia and over 1,000 for Japan (as quoted by the Daily Express, 28 September). We could not reproduce the 42 from any published official series. His words suggest diesel stocks measured against diesel imports: that is how many days of imports the stocks could replace, not how long until pumps run dry, since diesel is still refined in the UK and imported every day. It is a narrower measure than the IEA’s 117 days for all oil, so the two cannot be set side by side. The Express also reported that he said forecourt stock levels were close to normal. When reports in March said Britain had four weeks of fuel, Lord Whitehead called that “categorically untrue” (Hansard, 25 March 2026).

The risk being watched is American: the United States supplied 31% of the UK’s diesel imports in 2025 (DUKES 2026), and President Trump said on 27 September that he was looking at an export ban “very seriously”. None had been ordered by the morning of 29 September; our US export ban check follows it.

What ministers actually said on 28 September

“Ministers vow to help motorists as diesel hits record high” (The Telegraph, 28 September 2026) is about help with prices, not rationing. Emma Reynolds, Chief Secretary to the Treasury, told a CBI event at the Labour conference: “We are not powerless as government… we do have levers to pull at our disposal.” She did not say which, though The Telegraph read it as a hint on fuel duty. The Chancellor, John Healey, told ITV News that fuel duty plans would be confirmed at the Budget, and told the BBC, of a possible US ban, “we have our own stocks in the UK”.

Fuel duty is 52.95p a litre until 31 December 2026. The legal default is 55.95p from 1 January 2027 and 57.95p from 1 March, but HMRC says “the government will confirm final rates at Budget 2026”; with VAT the two steps would add about 6p a litre. As of 29 September no change to those scheduled rises, and no rationing measure, has been announced.

What to do, and what not to do

Buy fuel as you normally would. When many forecourts ran dry in September 2021, the Business Secretary said there had “always been and continues to be plenty of fuel at refineries and terminals”, and fuel companies and trade bodies said jointly that the problems were “due to temporary spikes in customer demand, not a national shortage of fuel”. The step the government announced that night was one of the plan’s supply measures, a temporary competition-law exemption so suppliers could co-ordinate deliveries (BEIS, 26 September 2021). Our fuel shortages guide explains why queues make things worse.

Keep the tank above a quarter as a habit. Do not fill cans: petrol vapour is a fire risk, and storing more than 30 litres of petrol at home means notifying your local Petroleum Enforcement Authority (HSE). Shop around: at 00:15 on 29 September our fuel price tracker had supermarket diesel at 197.3p a litre against 214.9p at motorway services, with diesel at £2 or more at 30.2% of the 7,680 forecourts selling it. And you need no law to slow down: at 70mph a car uses about 10% more fuel than at 60mph (Department for Transport, 2011).

What would change this verdict

The verdict is dated 29 September 2026. It would change if DESNZ activated any of the plan’s rationing measures, if the government ordered a temporary national speed limit, or if DESNZ reported supply problems at terminals or forecourts. A US export ban would not change it on its own: we would expect that to reach households first as a higher price. White diesel stocks fell in July; we will add DESNZ’s August figures when they are published on 29 October.