Kate and Gerry McCann have always vowed to continue searching for their daughter since her disappearance in Portugal 13 years ago.
A 43-year-old German national has been identified as the prime suspect in the toddler's disappearance.
The police investigation into Madeleine McCann's disappearance has cost almost £12 million.
Police have told the parents of Madeleine McCann they have two new lines of inquiry into her disappearance, it has been reported.
The Home Office has confirmed that it is considering an application from Scotland Yard for more funding to extend the investigation into Madeleine McCann's disappearance.
Police have put in a request to the Home Office to support the joint operation with Portuguese police.
The fund to find Madeleine McCann is set to run out by the end of this month, it has been reported.
The Home Office granted a request by the Metropolitan Police for more funds for the investigation into Madeleine McCann's disappearance.