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It's the Yamnaya connection. Ireland and England were populated by Neolithic farmers who built Stonehenge. They looked like Armenians.
They were later replaced by hyper-aggressive mean Yamnaya people. They were stronger and more energetic? For whatever reason they conquered them fast.
I read a good study that actually the Neolithics got their first strain+ of bubonic plague (yersinia pestis) from Yamnaya, and it greatly reduced their #'s.
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