NHS Providers said that it was unclear who would pay for the new system, which will cost money to implement and reduce revenue for hospitals

Hospitals have warned ministers that money for frontline care may have to be diverted to pay for their promise to abolish parking fees for some patients.

Matt Hancock, the health secretary, said that free hospital parking would be extended to those with regular outpatient appointment, staff on night shifts, the parents of sick children and blue badge holders.

The plan was in the Conservatives’ election manifesto and Mr Hancock said hospitals would be expected to start making the changes from April.

NHS Providers, which represents hospital trusts, said yesterday that it was unclear who would pay for the new system, which will cost money to implement and reduce revenue for hospitals.

Saffron Cordery, its deputy chief executive, said: “Trusts want patients to be able to