The Sun has sold a video documentary about the disappearance of Madeleine McCann to Channel 4 in a first for the tabloid publisher.

The move comes amid major investment in video at The Sun. Last week the title announced that political editor Harry Cole has been made editor-at-large, based in the US, to host a new nightly TV show produced with Red Seat Ventures and broadcast live on Youtube.

Madeleine McCann: The Unseeen Evidence was produced by The Sun with support from ITN Productions. It follows a year-long investigation by Sun journalist Rob Pattinson uncovering new evidence around Christian B, a suspect in the 2007 disappearance of the British three-year-old in Portugal. Christian B’s surname cannot be published because of German privacy laws.