It's not necessarily all a conspiracy with a script.
BB is a business. A big business. Even with slipped viewing figures and ending up on Sky 1 or W it would still be a reasonable size business. If it all comes out as a scripted scandal, their business is gone.
Instead they get people that they can manipulate. That doesn't make it good/right/whatever.
All this said, I understand why people are questioning things. Big Brother though has become predictable. The loft, being evicted to the task room, etc, etc... This is no different to what they've done so many times before.
There's been noise overheard this time (and in the past BB has made sure that people "be quiet", but this hasn't happened this time - not even white noise/bird noise was played into the house when noise was heard (or getting housemates inside). That would have happened in the past - both for "next door" noise or "outside noise".
Also Big Brother has done so many "next door" themes, it's a bit too obvious.
Add to that Emma didn't say on the live link "The public have been voting and the votes have been counted and verified.". Probably not allowed to say that, in fairness - but it's a big giveaway.
I don't think BB is scripted, but I think they have played things to how they want it - and I think they want the main house to realise that there's another house, they're not being anywhere careful enough to suggest otherwise.