Motorists buying diesel are being "fleeced" at the pumps as oil prices continue to fall, a campaign for lower fuel prices has said.

The FairFuel UK campaign said those involved in the fuel supply chain are "shamelessly" increasing profits and not passing on savings to consumers.

It highlighted diesel fuel as being the most affected, with falls in wholesale oil prices not being reflected on forecourts.

Wholesale diesel prices have dropped by 54% since May 2015 but drivers are paying just 34.6% less at the pumps, the campaign said.

Petrol prices have fallen by 40% in the wholesale market but at the pumps petrol prices have dropped just 27%.

Quentin Willson, motoring journalist and lead campaigner for FairFuel UK said: "Weeks and weeks of increased profits on every litre of diesel sold and weeks and weeks of not passing savings on to motoring consumers. And the fuel and oil industries wants us to feel sympathetic?"

Howard Cox, founder of the campaign said: "Everything about fuel pricing hits UK drivers hard at the pumps, from opportunistic profiteering suppliers holding on to beneficial recent oil price falls to the heinous 74% taxation in Duty and VAT.

"We call on the Competition and Markets Authority and the government to investigate and stop this unparalleled greed plus deliberate exploitation of motorists and our vital haulage industry whilst oil prices crash."