All we can infer (from the archaeological shards dug up in Berkshire, Devon and Yorkshire) is that the first Britons, whoever they were and however they came, arrived from elsewhere. The land (Britain) was once utterly uninhibited. Then people came.
Robert Winder, Bloody Foreigners: The Story of Immigration to Britain
britain, british, england, english, immigrants, migrants, oppression, race-relations, racism, white-privilege