Question about the curtain in the bedroom
 

Is it operated by Big Brother or is it operated by the housemates?

Because surely the housemates could just open it while tasks are being set up if they wanted to?

I would imagine it's controlled by Big Brother - like they've done before/do with the other blinds.
Like you said, they'd be able to open them when tasks were being set up which BB definitely wouldn't want.

Unless the curtain is inside two bits of glass either side or something. Where's OlderBlagger when you need them :p

Nope its Big Brother that controls it, they always do.

But how have they stopped them from just going up and opening it themselves?