I never said Prince Philip was a monster nor do I believe he "hated" Diana. If anything, I think he tried very hard to be supportive of the Princess and, according to Burrell's book, he later came to see how her view of the situation was certainly valid as well.
I think the Queen Mother was very enthusiastic about Diana at first because she was, after all, very fond of Lady Fermoy and had great expectations for the marriage. When those expectations later turned out to be Victorian, rather than suitable to modern reality, she rapidly turned sour on the Princess. She blamed her for not keeping Charles happy, as if that were totally up to Diana to do, and had very little sympathy for Diana's problems and related behavior.
It is clear from many accounts, however, that Prince Philip and the Queen Mother later came to share the view that Diana was a great threat to the standing to the monarchy and greatly distrusted her media manipulations. By the time Panorama aired, they were both finished with her.