As we enter a key Brexit endgame week, a few thoughts – informed by game theory – come to mind on the ironies of the British negotiation position and strategy thus far. The basic claim of bargaining theory is that you need a strong ‘reversion point,’ that you can go back to if bargaining fails. Once Article 50 was activated, that was necessarily ‘No Deal’ for the UK. But No Deal is likely self-damaging and certainly divisive. So, it did not and cannot represent a credible reversion point. Without this clear reversion point, one option is to pretend you want something self-damaging – the ‘madman’ approach. For this tactic to work, though, you need to be believed to be ‘mad’ …