Who says that the National Anthem is out of date? It has the same tune as Liechtenstein’s.
The present heiress to the Stuart claim to the Thrones of England, Scotland and Ireland is married to the present Heir to the Throne of Liechtenstein, making their eldest son the next in line to both.
And they have an eldest son (plus two more, and a daughter). He was born in 1995. In London. The first Jacobite heir to have been born in the British Isles since 1688. Think on.