I was going to say this as well. My pops who is West Indian but lived in London since the 50s had this type of accent.This man should read Audiobooks... This accent is also known as the translatlatic accent, white English South Africans had it too.
It was a way Anglo educated aristocratic people tried to sound more British/English without having to fake an Oxford /English accent.
So they developed this standardized way of speaking, letting certain words "roll".. Deliberate passes, even the gestures, the manner and tone in which they say "extraordinary" (Ex-Straw'd'nry).
I find all this stuff FASS'nate'n
At times, some Black America like Nina Simone's inflection would remind me of old Caribbean folks I grew up around











