Black English as British dialect?

A. In fact, many of the features we associate with black American speech are found in regional Englishes in the United Kingdom.

B. Habitual be is used by Irish English speakers, and black slaves learned it from indentured servants who spoke this dialect. Even when I be round there with friends, I be scared is good Hiberno-English.

C. Black English uses it where the standard uses there in such sentences as It’s somebody at the door. We see parallels to this in good old Cornwall: ‘Tes some wan t’the dooar.