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.
How did the Cape Colony divide?
Cecil John Rhodes, the 6th Prime Minister of the Cape Colony divided between two provinces in modern-day South Africa and was the founder of the De Beers diamond company.

Question: What else can you tell me about their distribution?
Self-contained rewrite: What else can you tell me about Britain's distribution?