Diana and Charles constantly briefed against each other, though! One aspect that I think would be really interesting would be if Valentine’s Low’s book covers what was going on behind the scenes in the Palace in the ;ate 80s/early 90s as it must have been an interesting time.
Just to remind you, when asked her thoughts about Charles becoming King, and whether she’d prefer William to be next in line instead, Diana was happy to say:
“being Prince of Wales produces more freedom now and being King would be a little bit more suffocating. And because I know the character, I would think that the top job, as I call it, would bring enormous limitations to him and I don't know whether he could adapt to that. My wish is that my husband finds peace of mind and from that follows other things"
And don’t forget she was very fond of making sure the press attention was on her when Charles was doing something significant - the “Revenge” dress, swan-diving off a raft repeatedly right in front of all the paparazzi in the Med on the day of Camilla’s 50th birthday etc. etc. And she treated other people disgracefully too in her turn, of course.
(I think their whole dynamic was disastrous for everyone, to be honest!).