The study carried out by genealogy website Ancestry obtained DNA samples from participants through saliva-based home testing kits.
The technique allowed researchers to trace the ethnic make-up of people as far back as 500 years.
The results of a test of two million people around the UK showed that on average......
In England, the average citizen is 37% British, with a smaller Irish heritage of 20%.
Scots are significantly closer to the Irish, with a 43.84% Celtic share mixed with 26.18% British, 13.05% from Europe west, as well as a Scandinavian element of 7.19%.
The Welsh have a more even combination, with an average British stock of 36.15%, compared to 31.99% Irish.
N. Ireland is made up of 48.49% Irish (Celtic) and 23.64% British (Anglo-Saxon).