Britons hiring cars in Europe have been hit with a mysterious charge since the UK voted to leave the EU.

The Sun reported how staff informed customers that it was levied as the vote saw the pound’s value drop.

The fee varied from £2.19 to £11.

British renters in France and Spain have been charged, but it may have affected thousands more across the EU.

Motorists’ rights campaigner Quentin Willson estimated that 7,500 Britons hire a car in Europe with Avis and Budget a day.

With an average charge of £6, that would see customers losing £2.6 million since the June Brexit vote.

Avis said the fee was a system error and blamed “miscommunication.”

It has vowed to refund affected customers.