Thirty years or so ago, I read of a "linguistics" study, involving asking people to judge the class level of three voice recordings. The people recorded were reading something innocuous from a newspaper. The three were a blue collar worker from California, an African American college professor in the American Deep South, and a London (England) cab driver. Almost without exception, the Londoner was ranked as the most intelligent and successful, with the blue collar worker in the middle, and the college professor ranked last. The study served to illustrate how much a person's accent and speech habits affect how they are judged by strangers.