How did I not see this before?

Charlie and Lola is a childrens TV and book series created by Lauren Child. It is a charming series featuring the long-suffering older brother Charlie and his ever-so-slightly off her head little sister Lola. It is Iris' absolute favourite so I have watched and read a LOT of Charlie and Lola in the time that I've been here. There's something mighty familiar about it though and I've only just put my finger on why...