That's all really interesting. When I start thinking of eps I think I can see something running particularly through the Nation and Boucher ones. With Boucher especially, a habit of not seeing in black and white, of giving the opposition its voice too (Par, Grenlee) and a rather lovely line in irony. And with both of them, for want of a better word, a moral dimension; I don't think there was one of their eps that didn't have a moral question at the root of it. Which is one reason I can forgive most of the flaws in Allan Prior's; I think he was the same in that respect, especially in Horizon and Volcano.