A shocking new theory about what happened to Madeleine McCann has been revealed on TV show This Morning.

Mark Williams-Thomas, an investigative journalist and former police officer, claims the youngster "left her holiday apartment and went searching for her parents at a nearby tapas bar" on the night that she went missing.

READ MORE: Madeleine McCann's parents fight shocking claims they had something to do with daughter's disappearance

He said: "On that morning of Madeline’s disappearance, we do know she went to Gerry and Kate and said: ‘Where were you last night?’”, he explained.

"Because we know the twins did wake up on days prior to her disappearance.

"And I think as a result of that, Madeline was clearly aware they were in the tapas bar that was in the resort.

Glasgow Times:

"Now the interesting element in that is in order to get to the tapas bar you had to actually come out of the premises, walk on a public road to go back in again.

"And that raises a concern I have in regards to Madeleine I believe woke up in the middle of the night, she went looking for Gerry and Kate and she left the apartment and went out.

"Because we know the patio door at the back was insecure."

Host Phillip Schofield then explained to viewers: "Legally we have to leave it there."

READ MORE: Madeleine McCann's parents fight shocking claims they had something to do with daughter's disappearance

It comes as the parents of Madeleine McCann launch a fresh legal battle as they fight shocking claims they had something to do with their daughter's abduction.

Kate and Gerry McCann’s lawyer confirmed the move after a Portuguese court ruling failed to clear them over any involvement in their daughter’s disappearance. 

Madeleine disappeared from a holiday home in Portugal's Algarve region in May 2007, days before her 4th birthday.

Portuguese police closed the investigation after detecting no evidence of a crime but British police are still looking into it.

Madeleine's disappearance sparked global interest as pictures of her and her grieving parents were published around the world.