A group calling themselves Innocent Voices door knocked the man on Sunday and confronted him with claims that he had engaged in on line discussion with what he thought was a young boy but was in fact a decoy used by the group. The video shows the man being challenged over his on line activity and concluded with the police being called. The group insisted they were videoing proceedings to protect both you and us. During the conversation representatives from the on line group said they had set up the sting to confront him over allegations of on line sexual grooming of children and for sending indecent images to a child. A spokesman for Cambridgeshire Police said: A 40-year-old man from Godmanchester was arrested on suspicion of sexual grooming. He has been released on bail until April 7.