I got curious a couple of days ago and looked up the Wikipedia article on the Royal family's wealth. Elizabeth Windsor, private citizen, was very far from short of a bob or two, but the bulk of the "billions" is the property of the Crown as a legal entity, and entirely unavailable for disposal by the person who currently occupies the position of monarch. I knew that, but I was surprised at just how small a proportion the personal wealth is, and how much of it was fairly recently inherited from people like the Queen Mother outside the direct line of descent.

I can remember there being a bit of a to-do about Edward VIII presenting Wallis Simpson with some jewels that he had somewhat dubious ownership of, because there was an argument that they were property of the Crown and not Edward Windsor, or at best entailed to him even if personal property.