Mostly by males and population replacement? Hmmmmmm? Where are we seeing that now?
It would make sense that refugees fleeing outbreaks of plague could be behind some of these resettlements. Of course the modern counterpart also often stems from another kind of plague: Islam.
But where early peoples may have been powerless and unsuspecting the leaders in the West who want a less Christian, or even less white, society are into civilizational suicide eyes wide open.
If the ancient British population replacement was mostly by males, wouldn’t there still be a significant amount of mitochondrial DNA from the earlier population. Also was the almost total replacement true for Wales, Ireland and Scotland?