Sean Pertwee's older Alfred in 'Gotham' was Cockney, so I guess it makes sense that this show from the same people is doing it too. They will have taken their lead from Michael Caine in the Christian Bale movies, presumably ... interesting, 'cause if I remember the Adam West TV show and the 4 Batman movies from '89 - '97 correctly Alfred was quite 'posh' in those.