Were tHe British Island people counted after 1066 when the Doomsday Book was prepared?
I picked up a modern edition of it (for genealogy) and it’s a real count of the inhabitants under Norman rule. That included everything more or less south of The Wall, and east of Wales, as well as parts of southern Wales, all of Cornwall / Devon (that was ruled by the Saxon kings after, hmm, probably Athelstan). The tiny place where my surname ancestors eventually hailed from is in there, had about 70 living there if memory serves. :^)