A lot of people (ot just in the BBC but in the NHS, the police, government etc) turned a blind eye to what was going on, but it doesn't seem likely there was a huge overarching conspiracy.
On the other hand, I'd argue that's the largest type of conspiracy. Such a widespread conspiracy that protecting women and children is a non-starter.
I mean, we're talking about protecting 1000s of women and children, and it's no surprise that no one, anywhere lifted a finger to protect them?! Seriously? That's a huge conspiracy on a societal scale, not a small one.