Police investigating the disappearance of Milly Dowler say a breakthrough in the case will be "a matter of luck."
Former deputy chief constable of Greater Manchester John Stalker says he has been behind the scenes of the investigation and the police are working very hard.
He says the inquiry into the disappearance of Holly Wells and Jessica Chapman in Soham would have been a very different one.
"The squad is at least twice as big as any normal murder squad," he told GMTV.
"Soham is much more self-contained. Walton is a commuter town , a suburb of London within three miles of the M25, which has access to all the motorway networks. They are looking for that little gem of information which may be in the system. It's still a matter of luck."
He also says whoever is involved with Milly's disappearance has "had the luck of the devil" . Of two CCTV cameras which might have captured their image, one was not working and one was blinded by the sun.
Amanda Dowler, known as Milly, went missing in March after failing to return home from the railway station in Walton-on-Thames, Surrey.
There have been three arrests since then, and one man has been bailed to appear again in September.
Surrey police say the investigation is still a priority, with 60 officers working on the case.
But in a statement to GMTV they admitted they had "no new leads to go on". Milly's parents have already been told she is almost certainly dead.