Another thought, in the light of my last post and this one, is that the Murdoch wars have been effective because they get to the Tories' System One, kinaesthetic, internalised skills, just in a context where they are unhelpful.
It's cricket, really - it's all about trying to identify the circumstances where the batsman's initial, muscle-memory, trigger movements put him out of his ground. And once you've worked that out, it's about keeping consistently at it. Line and length, line and length, until the percentages and the shameless psychological torture deliver.
Matthew Norman picks up on the prime minister's tendency to turn puce and behave horribly, although surprisingly for a cricket obsessive he didn't pick up the connection.