This could cost cash-strapped Britain hundreds of millions of pounds.
MEP Nigel Farage, leader of the second-largest EU British based political party, the UK Independence Party, said: “These demands with menaces from Brussels destroy any ability of the UK to set conditions on EU nationals from entering the UK and once here taking advantage of our welfare state.
“The EU is undermining British interests.
“I would like to remind the Eurocracy that the NHS is the National, not the International Health Service.”
An EU spokesman confirmed failure to comply could mean a fine.
Nigel Farage MEP