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Stephan Schiffels from the Max-Planck-Institut commented the Anglo-Saxon paper on Twitter:
So what happened since then? Comparing our medieval individuals with present-day people from England with exclusively regional ancestry (who are not representative of the diverse population in England today, of course), we found evidence of additional migration into England.
Specifically, people from England today have 20-40% ancestry from a source in Southwestern Europe, similar to Iron Age France, which would also fit with archaeological artefacts of Frankish origin. Most of this influx must have happened after the early medieval period. 8/11
One thing that I got asked a lot is whether we know how many people came during the early Anglo-Saxon period to England. Unfortunately this is pure speculation at this point. Different Scenarios are possible and give vastly different numbers. 9/11
Our sampling is certainly not representative of all of England, let alone Britain, and it's possible that local folks mostly moved westwards and mixed back in later, which of course would mean that migration proportions would be lower further in the west.