Ryanair has been criticised over a suggestion that it may start charging customers to use its aircraft toilets.

On BBC television this morning, chief executive Michael O’Leary suggested Ryanair could charge customers as much as £1 to use its onboard toilets.

He added: “One thing we have looked at in the past and are looking at again is the possibility of maybe putting a coin slot on the toilet door so that people might actually have to spend a pound to spend a penny in future.”

He denied that passengers could get caught short without the money, adding: “I don’t think there is anybody in history that has got on board a Ryanair aircraft with less than a pound.

“We’re all about finding ways of raising discretionary revenue so we can keep lowering the cost of air travel.”

However, O’Leary’s proposals for the low cost airline have already been attacked by Which? Holiday head of research Rochelle Turner.

She said: “It seems Ryanair is prepared to plumb any depth to make a fast buck and, once again, is putting profit before the comfort of its customers.

“Charging people to go to the toilet might result in fewer people buying overpriced drinks on board, though – that would serve Ryanair right.”