Again the assumption made by the article is that these are British ethnic minorities who would have a British Accent since they would have lived there. They are

Again the assumption made by the article is that these are British ethnic minorities who would have a British Accent since they would have lived there. They are not talking about non-British nationals. Here is another article that is anecdotal: https://www.theguardian.com/commentisfree/2016/dec/27/ethnicity-engineering-black-minority-ethnic https://www.theguardian.com/commentisfree/2016/dec/27/ethnic...