It was an interesting piece but now I am interested in how sensitive the Brits are to accent. Can someone point to an example of upper class speech vs lower cla

It was an interesting piece but now I am interested in how sensitive the Brits are to accent. Can someone point to an example of upper class speech vs lower class speech and stuff in-between? Accent very much colors perceptions in America as well. There are "redneck" and "urban" accents that would absolutely be a devastating red-flag in many job interview situations.