She said: “The body language dynamic between Zara and her uncle Charles has been giving joy for many years.
“If you were to place all the royals on some sliding scale of PDAs and tactile behaviour in public you’d see Charles close to one end as a rather hands-off, stuffy-looking kind of a guy while Zara would sit firmly at the other end as the most spontaneous and gloriously-gregarious-looking royal adult.
“Put the two together and you might expect Zara to tone her playfully affectionate rituals down with her uncle.
Despite having “differences” the expert claimed they appear to get on very well, with Zara looking “protective” of her uncle.
“Zara is clearly very fond of her uncle and in terms of showing that affection in public she just goes for it, taking the lead in a way that makes her look rather protective of him,” Judi continued.
“Charles is much more reserved in terms of his reciprocal signals but his wide grins and his close-quarters eye contact suggests he’s a very doting uncle to his sister’s consistently upbeat and fun-looking daughter.
“[In one photo] she keeps some torso distance but places a rather protective arm around his upper shoulders with her fingers touching his neck.
“Her more confident pose involves some leg-splay plus a hand in a fist-shape on her own waist and the elbow stuck out.
“Charles’s pose is more passive, with his hands clasped behind his back, but their eye-to-eye contact and head closeness signals an easy-going and playful relationship.”
The royal line of succession – who outranks who?
The line of succession to the British throne dictates the order in which each member of the Royal Family would ascend to the throne.
It is also seen as a ranking of importance with the head of the line, the Queen, taking the place of ruler.
Older children come before younger children. Traditionally boys came before girls, but this law was changed on 26 March 2015 before the birth of Prince William’s first child.
Incredibly, Catholics are still excluded from the line of succession, as are children born outside of wedlock.
The royals, who usually stick to a strict protocol when appearing in public, often arrive at events in ascending order of importance, with the most important royal arriving last.
Prince Charles, 72, is currently first-in-line to the British throne, followed by Prince William, 38, his oldest son.
Then comes Prince William’s children, George, seven, Charlotte, five, and Louis, two, and they are followed by Prince Harry, 36. Prince Harry is succeeded by his son Archie Harrison, born in May 2019.