Jake Kanter International TV EditorEXCLUSIVE: Christine Langan, the CEO of Steve Coogan’s film and TV production company Baby Cow, has stepped down after four years to launch her own production venture.Deadline can reveal that the former BBC Films chief has set up Bonnie Productions, through which she will continue to develop film and TV projects.During her time at Baby Cow, she oversaw features including Stan and Ollie and The Lost King, the Stephen Frears-directed project announced on Friday.