As Britain's NHS turns 75, author Henry Marsh, who worked as a surgeon and is now a cancer patient of the National Health Service, discusses his book "And Finally" which looks back at changes in the NHS over 40 years and the role reversal of being a patient in the service. Marsh was one of Britain's foremost neurosurgeons and his conversation roams from operating room tales to philosophy to the very different experience of being on the other side of the consultant's desk. Give us 39:50 to tell you all about the difference between being an NHS surgeon and an NHS patient.