Take some Picts, Celts and Silures
And let them settle,
Then overrun them with Roman conquerors.
Remove the Romans after approximately 400 years
Add lots of Norman French to some
Angles, Saxons, Jutes and Vikings, then stir vigorously, while noting that the Norman French were only a ruling class and that the genetic differences between the Angles, Saxons, Jutes are negligible and noting that Vikings are not a solidified race or culture.
Mix some hot Chileans, cool Jamaicans, Dominicans,
Trinidadians and Bajans with some Ethiopians, Chinese,