http://observer.guardian.co.uk/uk_news/story/0,,1283453,00.html

This is only fitting since in some decades there wont be much left to call "Briton" in the UK.

"Scientists used two key pieces of DNA to get the answer. First, they used mitochondrial DNA which is passed on only by mothers; second, they exploited the Y chromosome, inherited only from fathers. The mitochondrial DNA of Orkney people was found to be similar to that of people in the rest of Britain, but the Y chromosomes of Orkney men were found to be Scandinavian. Thus science suggests that Viking raiders took local brides. By contrast, the Roman invasion is reckoned to have had only a minor genetic impact because few Romans settled in Britain."

I bet some people will call "racism" in this study as it does not take into account the very real "New Britain".