In 2004, Jacobi starred in Friedrich Schiller's "Don Carlos" at the Crucible Theatre in Sheffield, in an acclaimed production, which transferred to the Gielgud Theatre in London in January 2005. The London production of "Don Carlos" gathered rave reviews. Also in 2004, he starred as Lord Teddy Thursby in the first of the four-part BBC series "The Long Firm", based on Jake Arnott's novel of the same name. In "Nanny McPhee" (2005), he played the role of the colourful Mr. Wheen, an undertaker. He played the role of Alexander Corvinus in the 2006 movie "".