Evidence gathered to rule out the sighting of a man and child previously thought to be Madeleine McCann and her abductor has been described as a "revelation" by police investigating the three-year-old's disappearance.
Detective Chief Inspector Andy Redwood told BBC's Crimewatch programme why the revision of the 9:15pm sighting in the timeline of the night of May 3 2007 has had such significance on the investigation.
Detectives have ruled out the key sighting that underpinned the original Madeleine McCann investigation and adopted a new focus in the hunt.
On the day she disappeared Madeleine McCann asked her parents a question: “Why didn’t you come when Sean and I cried last night?”
Latest appeal is the parents' best - and most likely their last - hope to find out through police work what happened to their daughter.