[Tor3]

In what way? I included England just because those particular periods are well-known. If you look at ALL of Europe's history, all up to recent times, there's been constant movements and migrations. People with different backgrounds, moving around, a lot of movement came as trade increased (and, as it has lately been found, there was much more trade even 3k years ago than anyone had previously anticipated). If you look at a snapshot of time it looks pretty static, but let your time-tick be generations and you see constant changes.

[nec4b]

It really hasn't been constant movement and migrations. Once the Germanic and Slavic tribes settled, which wasn't fun for the natives before them and certainly not for the Romans as well, the migration more or less stopped statistically speaking (exceptions were the wars).

[SV_BubbleTime]

Right, and this latest influx certainly outpaces anything in many generations.