The BCA and the BCAPL are very, very different organizations. I think you meant CSI/BCAPL.
It’s funny how the historical BCA rules are archived in many people‘s minds.
In my area, to the extent they specify, most tournaments play by “BCA rules“. Except they are not playing by BCAPL rules. They are really playing by WPA rules or, perhaps more accurately, they are playing by what used to be BCA rules before the CSI takeover and sometimes without regard to current WPA rules. For example, its often CB fouls only, despite the recent WPA rule change. If playing 8b sometimes it’s BIH behind the headstring like old BCA and current WPA, sometimes it’s BIH anywhere like BCAPL.
I suspect that aside from the issue of BIH on the break, if I could find my old BCA rule book from the 1990s, it would accord to what everybody considers to be “BCA rules” in most tournaments here and therefore what most people follow even outside of tournaments.