Contrary to popular belief, geneticists are learning--via DNA analysis--that the English, Irish and Scottish may genetically be the same people. Apparently, the idea that the Irish are largely Celtic in orgin and the English Anglo-Saxon is likely not true. The research shows that indeed all of the peoples of the British Isles derive from a common gene pool.
But if they're not Celts and Anglos, what are they?
The geneticists are also determining that the principal ancestors of today’s British and Irish populations arrived from Spain about 16,000 years ago, speaking a language related to Basque.
Click Nicholas Wade's English, Irish, Scots: They’re All One, Genes Suggest (NYTimes March 5, 2007) for more on this fascinating discovery.