You are conflating skin colour and culture. A non-white immigrant who speaks fluent English, and is from a country with a common law legal system and British in

You are conflating skin colour and culture. A non-white immigrant who speaks fluent English, and is from a country with a common law legal system and British influenced culture can integrate far better than someone from a European country who does not speak good English. There are more people in London whose "main" language is Romanian, Spanish or Polish than any other languages. https://data.london.gov.uk/download/vqlo7/c3df8c46-b070-439c-951b-10cb91ce8ae5/Census%202021%20release%20on%20Ethnicity%2C%20National%20Identity%2C%20Language%20and%20Religion.pdf https://data.london.gov.uk/download/vqlo7/c3df8c46-b070-439c... Only 4% do not speak English well. London has had a large foreign born population and a lot of immigration for a long time and was fine in the 1990s so i doubt things have changed as much as you think in recent years.