I find it all very very bizarre. In the New Years Honours List 1980, Joyce Grenfell was going to be made a Dame. She died a few months before the list came out so her name was dropped and she died as Joyce Grenfell OBE. They didn't give her a posthumous Damehood. I was asked to sign a petition at a charity event held in Joyce's memory to get her the Damehood and as far as I know, a letter was sent back saying that the British Honours System did not reward people posthumously. I can only assume it'd be the same for an HRH, otherwise, Wallis would have got hers yonks ago.