A by-election in Gorton and Denton next week could see a new left and right emerge in British politics, as Dan Haygarth finds out Sign up for the View from Westminster email for expert analysis straight to your inbox Get our free View from Westminster email Get our free View from Westminster email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice G orton and Denton is a constituency of two halves. On the east, the Gorton