"The genetic evidence shows clearly that this settlement of Britain which followed the ice age laid the basis for the modern European British population and that all subsequent invasions or migrations
occurred on a relatively small scale.
More importantly, none of these invasions ever replaced the original population. Previously, historians subscribed to this “mass replacement” theory, which in turn gave rise to the now-often repeated “nation of immigrants” propaganda line.
The “nation of immigrants” theory has proven to be completely false. DNA has allowed the accurate quantification of each invasion and settlement.
The genetic evidence shows, for example, that the division between the west and east of England did not result from the “Anglo-Saxon invasion” but rather from a much older— by thousands and thousands of years — origin with two main routes of genetic flow."
~ Arthur Kemp, Four Flags