The UK NHS (National Health Service), like healthcare in other countries, is a complex system. It is one of the largest employers in the world - some NHS Trusts employ around 20,000 staff and have a turnover of more than £1 billion. The NHS is not a single organisation - there are many parts that make up the NHS. However, these components do not operate as separate entities, they are interconnected and work together as a system. This creates challenges for those that lead these organisations. A recent report on leadership by The King's Fund: "Leadership in today's NHS: Delivering the impossible" questions whether senior leadership roles in the NHS are still "do-able".