AOG
I've explained this to you before, but I am more than happy to explain once again.
Black British kids rap in a specific English brogue. It is not in any way 'West Indian'.
You need to got to YouTube and watch this video from about 17 seconds in:
http://youtu.be/c2MiyZx8MTY
This is the accent that English rappers use. It's not a West Indian accent - it's an English accent.
You need to compare that to, say, someone like Shaggy - who really
does have a West Indian accent.
I'm not sure why you can't hear the difference.
To me, it's like confusing a Belfast accent with a Sydney accent.
I find your confusion quite quaint.