I haven’t looked up the stats but London must be at least a third black or south Asian ethnicity, maybe more. I’m sure any restaurant that was systematically racist to those groups would soon go out of business.
There’s also the issue that racism varies as a factor of multiple things. Take hair again as an example, people with not straight hair often get treated worse than those with straight hair. This applies to black people and Indians too, even when I lived in India. Having curly hair was seen as messy and unprofessional. So many of those places may have been fine with straight haired Indians but discriminated against curly haired ones.
When I grew up in India, I was denied a medical analysis by a doctor because I had curly hair for example. She straight up told me it was disrespectful to show up with that. We told her we’d complain to the authorities and she finally saw me (and we did complain after anyway).
Another example is Michelle Obama. If you see her recently, she’s embraced her natural hair. She straightened it when her husband was in office because it was just one more thing for them to be attacked on. A lot of Black women straighten their hair for office work to reduce the racism they encounter.
It’s often just that little extra difference that can put people over the edge.
https://en.wikipedia.org/wiki/Demography_of_London#Ethnicity...