Her image is renowned the world over: her trademark little round sunglasses, a petite woman in the scrum outside the trial of her ex-husband Dominique in Avignon, southern France; her face adorning murals emblazoned with her famous rallying cry "la honte doit changer de camp" (shame must change sides). So when I greet her at Sky News' Westminster studio on a sweltering Bank Holiday Monday, her warmth and affability are almost disarming.