Editorial : If the PM is to rebound from this disastrous result and fend off Zack Polanski from Labour's left flank, he must drop every distraction and ‘deliver, deliver, deliver’ Sign up for our free Voices newsletter for expert opinion and columns Sign up for our free weekly Voices newsletter for expert opinion and columns Sign up to our free weekly Voices newsletter Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice T he