Brixton (and I stand corrected by UK residents on here) which is a neighborhood in south London is basically the 'Harlem' of London or the UK. You say Brixton its the equivalent of saying you are from Harlem, Compton, southside Chicago, 5th Ward, you are black, lower socio-economic area.
I was staying with someone there years ago, last stop on the Victoria subway if my memory serves me correct. I was warned to move carefully. Once locals heard my American accent, I was good. Young folks, had Caribbean and African friends it seems. The older ones moved only in their circle.
Tariq has his biggest non American following in the UK because there are no buffers for blacks there. Roughly 5-6% of the overall population and no other group seen below them. The Indians, Chinese and to some extent even Pakistanis are buffer classes. Again, maybe I got it twisted, and I am open to be corrected.
I have heard from UK Africans that those from the Caribbean will look down on them because they were there first. West Indian / Caribbean, or I think known in the UK as Afro-Caribbean came in large numbers in the 1950s and 1960s. Africans didn't start coming in numbers till the 80s and big in the '90s.
The slang is a mix of cockney and west Indian, mostly Jamaican patois. The locals were used to my American black slang. I heard a mix, bumbaclaat mixed with cockney 'bruv' etc,
Anyway, I love this discussion as its a different aspect I've not seen. The BLM marches were big in England because the cops were doing the same bullshit to blacks as well. Also, the white boys go in hard. The skinheads in the '70s got it in, and also, the football hooligan kinda crowds would beef with blacks who moved in.
Birmingham (I think called Brum as a nickname) moves different than London. Way, way more Pakistanis and Indians there. That component as well. My understanding is they act like buffer classes in America and are anti Black. In London not as much.