What evidence exists for the idea that black people lived in Britain at the time of the Romans?

It has become for many people an established fact that black people lived in Britain 2000 years ago. This is despite the fact that there is literally no evidence at all for such a belief.
https://www.english-heritage.org.uk/learn/histories/black-history/#:~:text=There%20is%20evidence%20of%20African,present%20since%20at%20least%201500.

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