Although there has been controversy leading up to the airing of the BBC documentary, a body language expert told Express.co.uk William looked “laid-back” during his outing on Monday.

Body language expert Judi James told Express.co.uk: “If William is a man quietly overwhelmed by the pressure of tonight’s BBC documentary, he’s doing a very able job of not showing it here.

“His walk into the venue was unusually laid-back tonight, more of a signal of control and relaxed power than anything implying worry, anxiety or distress.

“If he’s sharing any emotions via his non-verbal cues here it would veer on the side of weary-looking anger, from the slight edge-to-edge teeth showing in his smile and the puckering of his upper lip when his mouth is closed.