Apparently they specifically chose the most gullable people to be on the show when they auditioned them. Someone my brother knows actually auditioned for the show, but they were never aware of what the show was about - until now. Load of crap though. I've only watched a bit of it - mostly last night's episode, but it appears all the ones who thought the show was a hoax have been left out of the actual 'space trip'. I can't see how even the idiots on board the 'shuttle' will think it's real once they've set off as it were. If it had been a big budget US show, I'd have more faith. Oh and Johny Vaughn being the presenter should alone be enough to make the cadets think it's a load of bollocks.
Aww, I actually feel kinda genuinely sorry for them, though just a little. But the whole thing reminds me the power of imagination during childhood. It didn't take much to turn a few cardboard boxes into a race car and win the F1 Championship! It proves if you want to believe something enough - you will. The contestants will probably figure it out in the end - they have 5 days up there in 'space'. If not, they can pretend to be in shock, suffer from paranoid delusions and nervous breakdowns and sue the producers for millions. Providing they have any brain in their head.