Greedy petrol bosses have been warned to cut pump prices or face the wrath of ministers.
The new energy minister, Claire Coutinho, sent them a scathing letter.
She wrote: “I will not hesitate to call out unfair retailers.”
Concern is growing that motorists are not seeing the benefits of both falling wholesale costs and the 5p cut in fuel duty.
Ms Coutinho has ordered officials to push ahead with a legal pump watch system that will force petrol stations to have their prices independently monitored.
While new laws are being drafted to make this mandatory, retailers have been urged to join a voluntary scheme.
The rising Tory star said: “Given the current global situation, it is more important than ever that consumers can trust that companies will remain fair when it comes to pricing.”
“I know families continue to face cost of living pressures and it is important that retailers pass on the savings in fuel prices at the pump as quickly as possible.
“I’ll keep a close eye on the prices.”
She warned that regulators would crack down on unfair pricing.
The RAC also warned that the impact of last year’s 5p tariff cut – following our Keep It Down campaign – would not be felt by motorists.