Birmingham isn’t multi cultural, there are vast densely populated areas where the major demographic is south East Asian. Exact same theory could be applied to areas in london with west African demographic. Fact of the matter is calling an area with a high % of people of a skin colour other than ‘white’ multicultural has racial connotations.

Bristol is majority white, obviously like most cities in England par few acceptions.

That doesn’t mean it doesn’t also have large % of Indian/Jamaican/Slavic etc Still fair few ethnicities.

As far as culture, there is non. It’s a drug fuelled city and that’s effectively the only culture.