She continued: “Charles’s aides asked William to praise his father’s role in the boys’ upbringing when the brothers appeared in documentaries to mark the 20th anniversary of their mother’s death.
“He refused. Only Harry paid a brief tribute. But his own relationship with their father suffered a severe blow when, in agreement with the Queen, Charles refused to let the Sussexes set up their own ‘court’ at Windsor after they split their household from the Cambridges’ at Kensington Palace last spring.
“It is certainly telling that when Charles, famed for his love of ‘black spider’ memos, demanded that Harry commit his ‘North America’ blueprint to paper, the characteristically impatient and sometimes petulant ‘spare to the heir’ went straight to granny.”
Ms Tominey also warned the “drama” over the Duke of Sussex will not be the end of it.