The actor, 45, starred as infamous criminal brothers Ronnie and Reggie Kray in the 2015 film Legend and received advice from former Kray hitman Freddie Foreman.
A royal source told PEOPLE : [William] is going to very much take an active role in it. On Monday, William met with Alastair Martin, the Duchy of Cornwall secretary.
The Royal Family s £20billion-plus fortune of cash, palaces, treasure, art, 500,000-plus acres of land and even the UK sea bed is laid bare today - making The Firm worth more than Tesco.