NHS review author Don Berwick on patient safety

Patient safety must become the top priority in the NHS in England, according to a major review by Professor Don Berwick, President Barack Obama's former health adviser.

Prof Berwick has won global recognition for his work on making hospitals safer. His mantra has been that health systems should not see mistakes as inevitable - and instead should learn from businesses such as the airline industry which advocate "zero harm".

Newsnight's Victoria Derbyshire began by asking Prof Berwick if the structure and size of the NHS is a problem.