I think the accents here were exaggerated for comedic effect. You are a right, I’m a Brit and would personally pronounce the ‘BOL’ to sound like ‘doll’ rather than ‘ball’. Unfortunately I can’t now find a reference to the original standards

too late to edit, but what I meant was "so-ball" (as opposed to "ko-ball")

I thought I knew almost all the differences between US & UK English, but this would be a new one on me, if true.