Professor Harry Keen, 87, a diabetes specialist for 50 years, and founder of theNHS Support Federation, which aims to protect the founding values of the NHS, still holds a clinic once a week. He recalls a visit to a boy called Billy in his home in the summer of 1948, soon after qualifying. “I received two shillings and sixpence and said I would call back. When I returned the mother informed me that Billy was a lot better. But as we spoke I heard a loud hac...