Kate and her fellow royals must not go to bed before Her Majesty.
In his book ‘The Royals in Australia’, former private secretary to the Queen, Sir William Heseltine, said: “Nobody felt it right to go to bed before the Queen did.
“For Diana the long royal evenings were agony. She’d excuse herself and go to bed, which was thought to be rather bad form.”
Selfies are not allowed to be taken with any member of the Royal Family.