I've been having a bit of a battle with my DD aged over TV. I don't like a lot of the shows on Nickelodeon and Disney mainly the American teen, high school, geek v popular girl type shows. I understand that she has grown out of Peppa, Dora etc. and don't mind her watching CBBC as at least there are some better quality shows on there - although can't stand Tracy Beaker but that's another post! I should also add that DD2 is 4 and often end up watching the same tv as her sister if they are in the same room.
Just wondered what tv your DCs watch before I set the parental controls on these channels!