You know that things are bad when the only viable option is as superlatively deranged as it is logically unavoidable. And yet, such is the predicament of the Tories. The very idea that the party could jettison its leader – the fourth in five years – mere months before an election seems beyond bonkers. Under Rishi Sunak, the Tories are merely disdained as chronically inept; another leadership psychodrama could see them spurned as clinically unstable. But if the party is to stave off an extinction