He added: “It is very important to wear it for a certain amount of time, because you get used to it then.
“But the big one that you’re crowned with, the St Edward’s Crown, it weighs five pounds.
“It is much heavier and taller, so there’s always that feeling of feeling slightly anxious, in case it wobbles.
“You have to carry it, you have to look straight ahead.”
The 17th Century golden St Edward’s Crown is worn by the monarch at the moment of their coronation and weighs 4.9lb (2.23kg).
But both King Charles III and Elizabeth II wore the Imperial Sate Crown – which weights just more than a kilogram – as they left Westminster Abbey.