In Birmingham & the black country there quite a few areas which are very obviously split down on race and religion. This is obvious from the result of immigration in the 1950s/1960s
For example Sparkbrook is a predominately Muslim area
Smethwick is very much a Sikh area and Alum Rock is very much Black African This is very obvious and it is isnt a criticism , it just the way the city has evolved.
There is quite a bit of data to back this up.
Does Sheffield have such a split of areas? or is to small a place for that to happen?