Filling stations and oil companies have been accused of "naked profiteering" over the price of diesel.
Retailers have doubled their profit margin, to around 7.4 pence a litre, in the past month despite the wholesale price coming down, meaning they're taking even more profit.
Instead of the prices at the filling stations dropping to reflect the drop in wholesale price, the prices have actually risen.
Geoff Dunning, chief executive of the Road Haulage Association (RHA), has hit out at their "predatory pricing" techniques in the wake of the fuel crisis situations that were seen at forecourts a few weeks ago.
He said: "We have no doubt that diesel prices at the forecourt have rocketed as a result of the uncertainty caused by the threat of a tankers drivers' strike.
"There is no justification whatever for this excessive charging. Profit margins on diesel were already reasonable and have now doubled."
The increase delivers a severe blow to the economy and hurts owners of small businesses who do not have their own bulk fuel supplies and are forced to pay forecourt prices.
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