I wasn't sure where to put this link, but one of the stories in
THIS ARTICLE from the Online Sun does refer to the 'dummy run' contestants for BB4!
First story's about the Sun running an alternative 'Pig Brother' - obligatory Jade mention here. Not funny, not clever, been done before.
The second story's about the antics of the test contestants inside the BB house - including alleged fumbling under the covers. Usual stuff, fueled by lots of booze.
And the third story reveals what's been going on in the German Big Brother.