Warning: this episode contains spoilers! The BBC blockbuster Celebrity Traitors has returned for a second series, attracting nearly 9 million viewers for its first episode. The show features a star-studded cast including actors Richard E Grant and Michael Sheen, and former model Jerry Hall and comedian Romesh Ranganathan. With 3 million more viewers than the last series tuning in for the first episode, why is Celebrity Traitors one of the few shows capable of attracting the nation to the sofa? Lucy Hough speaks to TV critic and broadcaster Scott Bryan - watch on YouTube