First of three reports on the state of the National Health Service on its 50th anniversary.

Six years after her 1982 assurances about the safety of the NHS, former Prime Minister Margaret Thatcher launched a surprise revolution. Leading political and medical figures talk to presenter Niall Dickson about arguments within the cabinet, conflict between doctors and the Government, and the point when even the resolve of Mrs Thatcher began to waver.
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(Pioneers, a series about the work of doctors who helped create the NHS, begins tomorrow at 9.30pm)