When does Charlie and Lola return?

Charlie and Lola is a British animated children's television series based on the children's picture book series by Lauren Child. It ran for 3 series from 7 November 2005 to 24 April 2008, winning multiple BAFTA Children's Awards throughout its run. The animation uses a collage style that emulates the style of the original books. Charlie has a little sister named Lola; he describes her as "small and very funny"