The editor changed from Alan Rusbridger to Katharine Viner in summer 2015: https://www.theguardian.com/media/2015/mar/20/guardian-appoints-katharine-viner-new-

The editor changed from Alan Rusbridger to Katharine Viner in summer 2015: https://www.theguardian.com/media/2015/mar/20/guardian-appoints-katharine-viner-new-editor-in-chief https://www.theguardian.com/media/2015/mar/20/guardian-appoi... IMO, around that time the editorial policy changed noticably too.