In that case though, doesn't stacked mean rotated 90 degrees? I don't recall seeing one with the letters on top of each other for years after the rebrand.
No - stacked means one above the other - not rotated.
So the stacked version of :
would be :
The main thing about the [B][B][C] logo was that you weren't allowed to break up the logo.
was forbidden. You had to rotate all three blocks as a single unit, not individually.
There has been 'some' relaxation - with some degree of animation and the BBC 'trinity' branding taking place (though this doesn't seem to have been pushed anywhere near as much as was envisaged)