The three young royals, the Duke and Duchess of Cambridge, aka William and Kate, along with William's brother Prince Harry visited Warner Bros studios in Leavesden on Friday.<br/> <br />For once, it was a chance to let their hair down on a royal visit with William assuming the role of Batman by mounting the Batpod. It seemed that William outed himself as a huge fan of the Dark Knight series directed by Christopher Nolan, taking great pleasure in playing around with the special effects and also making a plea to Warner Bros with this speech.<br/> <br />And he got further into the movie making spirit with the use of a clapper board....<br/> <br />After the speeches, it was time for the trio to enter Harry Potter's world - more specifically the Great Hall of Hogwarts. And while Harry checked out the detailed sets, William and Kate were given a lesson in fighting with the franchise's magic wands. But if the pair were to meet in a clash of spells, who would be the winner?