Years ago I was sailing on the Chesapeake Bay with an English girlfriend and visited Smith Island. She said the locals had a Dorset accent. The locals were probably descendants of the original Jamestown colony.
The Smith islanders called people on Tangier (a neighboring island) “cheese-eaters” because they said they spoke like they had a mouthful of cheese.
50 years ago I lived for a short time in Dare Virginia. Some Residents of that area had a very old English accent. It was lovely.