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Health tourism - how big a problem is it?

The Health secretary Jeremy Hunt says the NHS in England could save up to 500 million pounds each year by charging foreign patients - that's the equivalent of four thousand doctors - or 8 thousand nurses.

He says he wants to save the money by making foreigners pay a 拢200 charge if they're here for over 5 years - and by getting the health service to get back the money it's owed by other countries.

The British Medical Association is questioning the plans, Labour's questioning the figures - and a European Commission report has also downplayed the size of the problem.

So, health tourism - how big a problem is it?