[Neil Jones]

I wonder if they ever planned a kids version on ninja warrior. They have those waterparks and indoor theme activities and they are about to show the American kids version. They at least would have had the set. Also a kids version of I'm a celebrity set in the welsh castle, they could go nuts with slime and have less elaborate trials.

A lot of ITV's primetime entertainment could be re-formatted for kids. The Chase, Saturday Night Takeaway, one of the numerous Harry Hill panel shows, Tipping Point... hell, I'm pretty certain The Voice Kids and Ninja Warrior UK actually did air on CITV for their first few series.

Harry Hill's Shark Infested Custard was a thing. Which only lasted one series. Although it seems up for debate whether the whole lot went out or not, as for some reason according to Wiki it was looped halfway through the run. Anyway it was never seen again until Cartoon Network picked it up years later for some reason. Not one of Hill's better projects by his own standards.

I don't think Voice Kids or Ninja Warrior appeared on CITV Channel, the latter had a lot of repeats at all hours of the day and night (and network) - there are a few Ninja Warrior style "shows" on YouTube (America seems quite good at this sort of thing), and the other obvious example of a so-called "junior version" of a prime time show was Gladiators back in the 90s, and of course Crystal Maze via the Christmas specials.

That aside, the "junior" versions don't really last; they tend to be a passing fad, as the Gladiators spin off was (two series IIRC) although all the faffing around they did with the adult version's format probably didn't help. Just because it could be done doesn't mean it has to be done, and doesn't mean it would work either. Again - costs.