Polly Toynbee and David Walker have co-authored Dogma and Disarray: Cameron at Half-Time, Unjust Rewards: Exposing Greed and Inequality in Britain Today, The Verdict: Did Labour Change Britain? and Better or Worse: Did Labour Deliver? Polly Toynbee is a columnist for the Guardian. David Walker is a contributing editor to the Guardian Public and former director of public reporting at the Audit Commission.