Prince William was playing a charity polo match on the day his brother Harry and his family made their long-awaited private reunion with the king and queen at Highgrove House on 10 July.

As heir to the throne William was born into singular privilege. How he uses it and the work he chooses to pursue presents a 'manifesto' for the king he will become.

Prince William was playing a charity polo match on the day his brother Harry and his family made their long-awaited private reunion with the king and queen at Highgrove House on…