Detective Chief Superintendent Bob Taylor was instrumental in bringing some of the UK's most notorious killers, rapists and kidnappers to justice. In the second part of our exclusive interview, he tells Simon Ford about the part he played in the 2002 Soham murder investigation. Plus, he expands on what makes a psychopath; developments in forensic science; and the impact of terrorism on police procedure. Simon starts by asking DCS Taylor about the questioning of John Humble, the 'I'm Jack' hoaxer who sent the Yorkshire Ripper investigation on a wild goose chase — with fatal consequences.