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Given that I'm from America and not the UK, AND the fact that I found this through looking for obscure Korean shows rather than finding it through UK cartoons, I wasn't sure at first considering its obscurity, however I saw on the bottom of this youtube video someone said this "I remember used to watching this in Popgirl because of my sister lol and I actually liked this :'D"
Therefore I am like 99% POSITIVE you are talking this show, Z-Squad (https://www.youtube.com/watch?v=mXaxm53h0IA)
If you aren't I have absolutely no idea because I've searched and searched and found nothing else

I can't remember the name of the show, but it was 3d animated with a sort of anime style to it. There were three main characters, all female - one had red hair and some sort of fire symbol, one had pink hair, blue eyes and a heart symbol, and the third had green hair, glasses and a clover symbol. I can't remember much about it, but they each had mascots that looked like toys and I think they were all undercover superheroes. It was aired on Popgirl, but I can't find any information about it. All my web searches have come up with Totally Spies, which isn't what I'm looking for.