A DNA study of Britons has shown that genetically there is not a unique Celtic group of people in the UK.
According to the data, those of Celtic ancestry in Scotland and Cornwall are more similar to the English than they are to other Celtic groups.
The study also describes distinct genetic differences across the UK, which reflect regional identities.
And it shows that the invading Anglo Saxons did not wipe out the Britons of 1,500 years ago, but mixed with them.
Published in the Journal Nature, the findings emerge from a detailed DNA analysis of 2,000 mostly middle-aged Caucasian people living across the UK.
The individuals included had all four of their grandparents living close to each other in a rural area.
This selection criterion enabled the researchers, led from Oxford University, to filter out 20th-Century immigration and to peer back to migration patterns more than 1,000 years ago.