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Dramatic_Hammer
Surprisingly enough, regional groups that correlate to post-Roman immigration are still extant.
This is based upon genetic analysis.
Perhaps more surprising, is that the same results are achieved with the analysis of surnames: eg a Lancashire Wilson will have a common heritage with most other Lancashire Wilsons.
It's only since the industrial revolution that any more than a small minority have been mobile to any appreciable degree. And, in relative terms, that is very recent.
And even then, much of the migration preserved the original groups: people largely migrated to their regional centre, rather than to centres in other regions.