Gordon Brown has warned that senior Conservatives are "testing the water for a different kind of NHS" which could see the public charged for some services.
The former prime minister hit out following a claim by Sajid Javid that patients should pay a fee for visiting GPs or A&E wards.
Javid, a former UK health secretary, claimed in an interview last week the NHS could not "survive much longer" without radical change including introducing patient charges.
