The ageing parents of a teenage boy abducted 30 years ago have made a final appeal for information about his fate.
Martin Allen, 15, was last seen by a friend at King's Cross Tube Station as he made his way home from school on November 5, 1979.
His case has baffled several teams of Scotland Yard detectives who have been unable to find any trace of him.
Tom and Eileen Allen, of Bordon, Hampshire, admitted they have lost hope of seeing him again and fear they may die before his body is discovered.
Mrs Allen, 81, said: "We just want to know what happened so we can have some final closure. But of course it will never go out of our minds. My biggest wish is to have a meeting of the family and a remembrance service, not a funeral, but a service so we can put our memories away.
"We just want to know what happened. Somebody must know something. Please tell us so we can move on."
Mr Allen, 85, revealed he still cries on the day his son disappeared, his birthdays and when he hears music he loved. He said: "I just break down. I go out into the woods and I simply burst. After that I am all right. I cannot help it. I had hope until the beginning of this year. I still had lots of hope but suddenly it disappeared. I do not know why."
Metropolitan Police officers continued to investigate the disappearance of Martin since a review took place in 2006 but admit they have no new leads. The teenager went missing as he travelled home from school to pick up some money to take to his older brother Bob in Holloway.
His father worked as a chauffeur and his family lived in a cottage in the grounds of the Australian High Commission in Hyde Park Gate, Kensington. Martin left a friend at a foot tunnel leading on to the southbound Piccadilly platform at King's Cross station at about 3.50pm. He has not been seen since but a passenger came forward after a television appeal and said he saw a man and a boy acting suspiciously at Earls Court.
The man was standing with his arm around a boy who looked like Martin and both appeared nervous. The man was heard to say: "Don't try to run." Despite a huge operation, including a visit to every property in Earls Court and the publication of an artist's impression, police have not been able to trace the man. Anyone with information should call the incident room at Hendon on 0208 358 0100 or Crimestoppers on 0800 555 111.
