The parents of a missing British child have been banned from appearing on Barbara Walters' talk show to promote their plight. Gerry and Kate MCCann have been touring the world, appearing on TV to raise awareness of the disappearance of their four year old daughter Madeleine from a holiday resort in Portugal in May (07). Walters invited the couple to appear in an hour-long TV special - but they would face prosecution in Portugal, where they are still officially suspects in the case. According to reports, the MCCanns' legal team is searching for a loophole that would allow them to reach a potential TV audience of tens of millions.