By Rob Freeman and Ben Mitchell, Press AssociationThe mother of a sailor missing for 40 years has called on the man she believes responsible for his disappearance to reveal what happened to her son. Simon Parkes, from Bristol, was last seen in December 1986 when the Royal Navy ship he was serving on, HMS Illustrious, was docked in Gibraltar. Now we want to have an inquest so we can also be given a death certificate after nearly 40 years. Announcing the end of the investigation in December, Detective Superintendent Adam Edwards said: “Officers have worked tirelessly to investigate the disappearance of Simon Parkes and to find answers for his devastated family.” “The full circumstances surrounding Simon’s disappearance still remain unknown, however police will continue to support the ongoing coronial process.”