Sir David Nicholson - Chief Executive of NHS England

The NHS's reputation has been damaged by recent shocking revelations of failings in patient care, but state-funded healthcare free at the point of delivery to all citizens continues to be regularly described by by politicians of all stripes as one of the country's greatest treasures.

Stephen Sackur asks the chief executive of NHS England, Sir David Nicholson, if the National Health Service is capable of meeting the shifting demands and daunting financial challenges of 21st century healthcare.