Callow appeared with Saeed Jaffrey in the 1994 British television drama series "Little Napoleons", playing a scheming Conservative councillor in local government. In 1996, Callow directed Cantabile in three musical pieces ("Commuting", "The Waiter's Revenge", "Ricercare No. 4") composed by his friend Stephen Oliver. "Ricercare No. 4" was commissioned by Callow especially for Cantabile. He voice-acted the sly and traitorous Wolfgang in "Shoebox Zoo". In 2004, he appeared on a Comic Relief episode of "Little Britain" for charity causes. In 2006, he wrote a piece for the BBC1 programme "This Week" bemoaning the lack of characters in modern politics. He has starred as Count Fosco, the villain of Wilkie Collins's novel "The Woman in White", in film (1997) and on stage (2005, in the Andrew Lloyd Webber "musical" in the West End).