In thinking about the Royals it seems to me that it was unfortunate that Charles was not allowed to marry Camilla when they were young. For one thing, lovely Diana would probably still be alive. For all the luxuries they sure have some weird rules.
And yes, the rules have relaxed a lot in the past few decades. I read that when Princess Margaret got divorced it paved the way for more relaxed attitudes about it. Out of the Queen's four children only one has not been divorced.