Zack Polanski vows to stay on as Green Party Leader

Zack Polanski has insisted he will stay on as the leader of the Greens, despite a by-election defeat at a time when he's already under pressure from many within his party. Also: This year’s Nobel Peace Prize has been awarded to the South African judge, Navi Pillay. And ministers have said they will introduce tougher regulation of assessments for autism and ADHD. (Image: PA)