THE parents of Madeleine McCann yesterday went back to

Portugal to plead for help in finding their missing daughter.

Ahead of the launch of their new book - called Madeleine - Kate and Gerry blitzed the media with a series of interviews.

Mum-of-three Kate, 43, said: "We need to find her and bring her back home to her family."

She admitted she felt guilty if she ever laughed but added: "It's important to be strong and relax from time to time."

Kate blasted Goncalo Amaral, the ex-police chief who wrongly implicated the McCanns in the disappearance. They are suing him for defamation.

She said: "He, more than anyone, has prejudiced the search for Madeleine."