Just caught the end of that Andy, thanks for the link - how blustery was Edwina!
Martin from Saffron Walden had it right I think - a reasoned explanation (I wonder if I've met him, as I lived and worked there in a similar area to him).
The point about psychopaths is that they all have a shrunken amygdala - and that is the repository of empathy and emotion - one wonders how it becomes shrunken.