Sir John Curtice: Greens' win means future of British politics is more uncertain than ever

Sir John Curtice: Greens' win means future of British politics is more uncertain than ever

Not only did Hannah Spencer become the first Green to win a by-election, she won it well.

Labour could once be assured in Gorton and Denton of the support of, first, less well-off working class voters and, second, those from a minority background, both of which are especially numerous in … [+115 chars]