It's tempting to imagine a dinner party conversation between David Gray and Jonson Cox. The two would have a lot to talk about. Cox took the chair of Ofwat at a moment of crisis last year, when the regulator was engaged in a public stand-off with water companies over proposed reforms to licence conditions. As Gray prepares to assume the chair of Ofgem, the energy regulator is in an even tougher predicament, with the media and opposition politicians calling for its dissolution. So what tips might Cox have for Gray? Let's let our imaginations run wild: