In my experience BBC News is interesting for presenting US events from the outside perspective, showing how US events are perceived overseas, but it's not actually reliable as it views things through a rather skewed lens.
For example BBC will often discuss US politics as if we have the same parliamentary system, and so will get things a bit wrong.
BBC also does this weird thing where they will read out listener comments as if they are fact when they're actually simply wrong.
So yeah, I've been listening to BBC consistently for years, and it's interesting, but not reliable at all.