Mother of Royal Navy sailor missing for 40 years calls for suspected killer to confess

Margaret Parkes and her husband, in their 80s, want Allan Grimson to reveal location of their son Simon’s remainsThe mother of a teenage Royal Navy sailor who vanished 40 years ago has called for a “serial killer” suspected of murdering him to finally reveal where her son’s body is hidden.Speaking as Simon Parkes’ suspected murderer, the former navy petty officer…