The cost of diesel has been slashed to below the £1-a-litre mark across the forecourts of several major retailers.
In a move that is likely to intensify the forecourt price war, Morrisons, Sainsbury's, Asda and BP said that their pumps will be selling diesel at 99.9p a litre.
Marc Bolland, chief executive of Morrisons which sparked the wave of reductions, said: "Morrisons is taking the lead again in helping motorists. We are absolutely committed to giving the strongest value for our growing number of customers."
The move means that drivers of a typical diesel family car will be more than £18 better off on a full tank of fuel than they were in July.
Supermarket chain Asda also said that it was reducing the price of its diesel to 99.9p a litre, with petrol coming down to 87.9p a litre.
BP cut diesel prices by up to 3p per litre to 99.9p at 300 of its company owned sites and Sainsbury's has also followed suit.
Other major retailers are expected to respond in kind.
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