When the pound falls against the ruble, someone needs to U-turn, sharpish. I really, really hope that whichever scriptwriter put the "You turn if you like" joke into Maggie Hatchett's speech meets a suitably gory end: he or she has made it impossible now for *any* politician to admit they were in error, and need to correct the course of the country, in the light of fresh evidence. Even casino owners don't permit punters on a losing streak to double down on a bet more than once.