By Hollie Bone Cold case detectives have revealed they are still hunting for answers over missing Claudia Lawrence 15 years since she disappeared. Chef Claudia, then 35, was reported missing after she failed to report for work at the University of York in March 2009. The case was treated as a murder inquiry by North Yorkshire Police almost from the start and has become one of the most high-profile unsolved crimes of the last 20 years. Now the force has urged people with information to “break their silence” and end her family’s heartbreak. Acting Assistant Chief Constable Wayne Fox said: “The s…