CD:UK first aired in 1998 as an addition to ITV's popular Saturday morning childrens show SM:TV Live. Ant, Dec and Cat hosted the show for the first three years. After the third year, Ant and Dec decided it was time to leave, going onto become Saturday night TV stars. After they left the show's ratings dropped and Cat left shortly after.
The show, like SM:TV went through a lot of celebrity guest presenters and even after a complete relaunch, with the UChoose Chart, a new set and permanent presnters (Myleene Klass, Johnny Pitts and Lauren Laverne), the show wasn't renewed for a new series.