When three officers flew to Barcelona for two days last month they met detectives from Spain’s Drugs and Organised Crime Unit.
One theory being considered is that Madeleine’s abduction was part of a sophisticated child kidnap racket, possibly involving Spanish gypsies.
The McCann’s private investigator Dave Edgar has had discussions with Scotland Yard about a woman in Barcelona who has never been traced.
Four days after Madeleine vanished from Praia da Luz in Portugal on May 3, 2007, the woman, a Victoria Beckham lookalike, spoke to a British man on a stag night and asked him a strange question along the lines of: “Have you got her? Have you got the child?”
She appeared to be expecting to meet a man at 2am who would be handing over a child.
Scotland Yard will be examining that contact.