“If they were curled into fists the splaying could appear confrontational or even angry but performed like this it just suggests that he is re-booting his authority but without any hint of aggression or challenge.”
The expert claimed: “The source of the pose can be seen when he is chatting to the army leader about jungle survival.
“Both men adopt an almost identical arm with splayed fingers and it suggests this look is a trait from William’s military career.
“He seems to adopt it when it is just him and Kate and the press around and, again, this could look like a desire to be in control in these circumstances rather than just posing up compliantly for the cameras.