Oh really, so our turtle girl is now played by a dark actress, following on the tail of the little mermaid. Well she will sunburn less than as a ginger.
Yes, there were plenty of black people in England long before the Victorian era. Most of them are Britons descended from slaves, the trade which began the 16th century under Elizabeth, according to Hakluyt, don't forget John Hawkins was a slave trader. This continued until there was quite a community by Georgian times. Long before this, some Roman soldiers who went there and were stationed along Hadrian's Wall were African.
https://www.blackpast.org/blog/early-black-british/