Prince Harry will be "gathering anecdotes for his next assault on his family" when he returns to the UK for King Charles' Coronation, according to Paul Burrell.
The Duke of Sussex will attend the historic event without his wife Meghan Markle, who will remain in California with their children Prince Archie and Princess Lilibet.
Princess Diana's former butler Paul, 64, has said Harry will find it very difficult when he has to "kiss the hand of Queen Camilla" following the fallout from his tell-all memoir Spare.