I've lived in Britain for over a decade, so maybe your own confident judgment of my lack of familiarity with the place is a little off, unless you think a decade there, speaking the language, following the local press, meeting people at all social levels in various contexts and even being a member of one of the political parties there, is not enough to "know Britain".

I just don't keep up with Most Rich List of the country, not even when I lived there much less now that I don't so don't really know the exact order at the top right now. Further the wealth of the Royals is subject to much controversy since how much it is depends on things like whether the Crown Estates are considered part of it or not, since the income on those goes to the Treasury but it then gives them part of that money (so they get almost £100 million per year).

Last I checked (when the Queen was still alive) the Royal Family where personally filthy rich AND had exclusive use of very expensive properties owned by the State AND even got a couple of millions every year as a stippend.

Compared with, for example the Dutch Royal Familiy (a country were I also lived for almost as long as Britain), it was like night and day.

Also if you need more examples of how Wealth in Britain is linked to the Monarchy, look up just how wealthy the Duke Of Westminster is (mainly due to how much of London he owns). You can also go down the list of hereditary peers in the House of Lords and check their wealth.

I mean, one needs to very purposefully and very strongly be closing their eyes to not see how a large part of the wealth in Britain is in one way or another in the hands of people linked to the Monarchy (again, a situation which is a veritable night and day contrast with The Netherlands and their Monarchy).