Armando Iannucci’s new retelling of Charles Dickens’ “The Personal History of David Copperfield” is rounding out its cast. Tilda Swinton, Hugh Laurie,”Dunkirk” breakout Aneurin Barnard, Ben Whishaw, Morfydd Clark, Anthony Welsh, and Rosalind Eleazar have all joined Dev Patel, who will play the title character. FilmNation could not be reached for comment.