Conversation so far:
What was the geographic distribution about converning British people?
The earliest migrations of Britons date from 5th and 6th centuries AD, when Brittonic Celts fleeing the Anglo-Saxon invasions migrated what is today northern France and north western Spain.
Where was Britain located geographically?
Britain today is now located to the right of Wales.

Question: How did they divide?
Self-contained rewrite: How did the Cape Colony divide?