Many aeons ago I wrote in to CBBC (about something computery) and they replied by sending me a 5 1/4" disk with the original animated BBC B logo as in the picture above. I didn't have a disk drive at the time and had to take it in to school to watch it. It must have been the modified version, since I remember thinking that it didn't use colour mapping for its animation. I'm pretty sure I still have it somewhere!
For me, at least, it was a real inspiration to see what CBBC were doing with BBC computers (and later the Archimedes). I loved the animated graphics.
And I can't have been the only one. If I remember correctly, Blue Peter ran a competition for someone to design a new animation, and a train producing letters as smoke won.