In 1986, British Labour politician and journalist Chris Mullin published "Error of Judgement: Truth About the Birmingham Bombings", which provided further evidence that the men had been wrongly convicted. The book included anonymous interviews with some of those who claimed to have been involved in the bombings, and who claimed the protocol 30-minute warning bomb warning had been delayed because the preselected telephone box had been vandalised, and that by the time another telephone box was found, the advance warning had been significantly delayed.