Labour's brutal defeat in Gorton and Denton will set up weeks of soul-searching at the top of the party. The handsome majority the Green Party's Hannah Spencer won in a previously safe seat will has been dubbed a wake up call for the leadership. The warning signs were there - Labour left-wingers have long accused Keir Starmer of focusing too heavily on Nigel Farage , leaving himself vulnerable to the Greens, led by an energetic Zack Polanski. The latest setback will really sting. If the Greens