It’s been explained previously why now.
Neither of his parents made seventy.
Rochard Kay said this is the first time he can write a book without hurting his sister who was married to the senior courtier, Robert Fellowes, who died recently, and not put them in a difficult position, and also he can write now without hurting his late godmother, QE2 or Prince Philip,
Plus I feel that he has a burning desire to right some of the injustices done to his family and his sister by King Charles and the royal machine,
Just that little anecdote about Princess Margaret meeting Diana outside of Kensington Palace just after Diana had lost her HRH title and saying to her;
“ Don’t worry Diana, you will only have to curtsey to me in public from now on”
gives a good hint I think of that toxic family and how they operate. I’m not saying they are all like that but it points to what they consider important.
And as has been said before, it’s not healthy to have a head of state who is so shrouded in secrecy and deference that we are not allowed to know much about their finances or their state of health, or challenge their decisions and behaviour.