CEP Senior Advisor Ian Acheson writes: "It was an atrocity that shook the nation. In June last year, Valdo Calocane stabbed to death 19-year-old students Barnaby Webber and Grace O’Malley-Kumar in Nottingham, going on to kill 65-year-old Ian Coates. Calocane then stole Mr Coates’ van and used it to seriously injure three more people by mowing them down in the street before police apprehended him."