[DTV]

Quite like this graphic of the layers to the rebrand: i.imgur.com 

That graphic is from November last year at the latest - because that's when the new Doctor Who logo was revealed, and the graphic has the previous one on it. So, yes, definitely also before the kids channels' new logos were created. Though you'd think they'd have just used the old ones.

Though I believe the basic 'onion' graphic is something that's been around since fairly early in the Reith rollout. I recall there was a clip of a presentation from several years back explaining how they were going to originally implement it (including keeping the 1997 logo) with a similarly structured black-and-white chart, though, given the on the hoof nature of the rebrand, few of the same branding elements.