Just a year or so ago, there was another study saying that the current gene pool of Britain is largely identical to that of the neolithic inhabitants of the Island—meaning that the numbers of Celts who came to Britain around 500-300 B.C. and the number of Anglo-Saxons who came in the 5th and 6th centuries A.D. were quite limited. This was pretty hard to digest, since the accepted view of Britain is based on the idea of its being formed by the successive conquests by Celts and Anglo-Saxons. But now the revised view is being thrown out and we’re returning to the previous conventional view (at least as far as the Anglo-Saxons are concerned) that the Anglo-Saxons wiped out the Celts or expelled them to the Western fringe of the island. I’m glad I didn’t take the revised view too seriously.

You’re right, it’s puzzling. A few years ago there was a study comparing the DNA of some inhabitants of an English village with the DNA of some 8,000 year old human remains found nearby that turned up some close matches. Eventually I suppose they’ll put the pieces together.