Princess Margaret & Prince Philip may have been a ‘challenging double act’, expert claims

This means that she either found the remark funny and couldn’t show that in a facial expression, or she was annoyed at something the Prince said.

Judi suggested possible signals from this video clip that showed a “strong bond” between Margaret and Philip.

“This subtle and rather ‘deadpan’ tie sign, which is a small, silent conversational cue, suggests strong bonds of shared humour between the Prince and his sister-in-law, with perhaps a hint of shared rebelliousness between the pair,” Judi argued.

“Neither suffered fools gladly and they could have made a challenging double act when they got together at royal events.”