Lou Smit was the one who did the partial demo over and over again on TV. I don't think you saw Tom Bennett do it.
It was on a documentary within the last year aired on Court TV. He didn't demonstrate it over and over. He just did it once as he was talking about his investigation. At the time, he made a comment about detectives thinking it was too small, then he just did it. I need to see if I can find the documentary. It was very interesting!