There are fears that the £2-cap on single bus fares could be scrapped after the government declined to say whether the policy would continue past December.

Bus companies said it was vital the cost of using their services is kept low for young people to “enhance their access to education and jobs”.

Alison Edwards, director of policy and external relations at industry body the Confederation of Passenger Transport, said: “Bus operators are working closely with the government so that together we can find a way to avoid a cliff edge return to commercial fares.

“Analysis has shown that supporting fares, which can be done in a range of different ways, is great value for money and can support many other government objectives.

“For example, keeping fares low for young people would enhance their access to education and jobs, while also encouraging them to develop sustainable travel habits to last a lifetime.”

Transport Secretary Louise Haigh said in a recent interview with the PA news agency that her officials were “looking at various options” in relation to the cap, including whether they could “target it better”.