Another day, another stupendous carnival in the eternal situation comedy of politics. Forget the soaps, ditch the detective shows, this is the acme of aching sides. Parliament is a three-ring circus right now and Theresa May in fishnet stockings, corset and killer heels is wielding her whip as the all-powerful ringleader. The music swells and the familiar tune crackles out from the speakers. As Entrance of the Gladiators plays through the tinny tannoy the Shadow Cabinet clown car lurches into the arena, steam issuing from the bonnet, different sized eccentric wheels wobbling and comes to a rest with a comedy backfire as all the doors fall off.