Dr Sam Everington, deputy chairman of the British Medical Association, said medics would be worried about unlimited private sector involvement.
BBC: Can you spot the difference?
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According to Mr Everington, high streets should build on their "uniqueness" although he feels the biggest problem they face is parking charges.
BBC: Portas' Pilots: Lessons from the shopping centre
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Speaking on the programme, Dr Sam Everington, GP in Tower Hamlets in London, said that the government needed to address the fundamental cause of ill health.