The BBFC's weird hangup about headbutts is the answer. They were originally edited out of the UK version.

I once waited round the back of a tent at a fair at a country park in my Cubs uniform to get his autograph. I hid my disappointment that he hadn't screened any cartoons earlier inside the tent - although I don't know exactly how that would have worked.

<anecdote best delivered in a Partridge voice>

It's certainly removed a lot of the pop-culture gatekeeping, niche interest barriers to entry and playground received wisdom that I grew up with.