volver
^The Queen's mother was Scottish.^
No, she was not.
You appear to be confusing her father holding a Scottish Earldom with actually being Scottish.
Through her mother's family, the Bowes-Lyons, Earls of Strathmore, she could trace her ancestry back through generations of Scottish nobility to Sir John Lyon, Thane of Glamis, who married Robert II's daughter in the fourteenth century.
It is nothing to do with an Earldom. Ethnically - if you do a DNA test - she will show up as having Scottish DNA. It may not be 100% Scottish but it would be rare to find anyone who is 100% anything.
I wonder what we would find it we did a DNA test on you Volver? Families have found some really surprising results. I, for instance, would have two strands leading to French DNA although it will have been divided down by other ancestors by now.
somebody born and brought up in Hertfordshire
That is completely irrelevant. I was born in Germany and spent a large part of my childhood there, but I am, neither by heritage nor national identity, German. That really is a very strange way to look at it. Again, this sort of idea is one we might see from extremists who think they can decide who people are and who they are not.