“I think she had high regard for how her involvement with Charles would impact on Prince William and Prince Harry and therefore, she made sure to maintain a distance.

“While Camilla and Charles would appear together in photographs in the 1970s and 1980s, you’ll see they were always separate and there was a reservedness between them.”

As the body language expert pointed out, Camilla rarely appeared comfortable under the glare of the royal spotlight in earlier years.

He explained: “In early photographs, Camilla had a tendency to hide her true feelings, she appeared closed off.