I agree with the original comment. Although I have only seen this series about 3 or 4 times, the times I have seen it it has appeared blatantly obvious that it is fake.
They may infact be in Australia, but we are certainly not seeing an accurate picture of what the setup there is.
For a start, these bits with Ant and Dec talking to camera, its obviously a studio, looking at the prop trees/bushes close to them, they are from a different camera to the one that has taken the footage of the waterfall in the far distance - it is like that wall you used to get on the credits of Coronation Street, where they had a real wall, in front of a photograph of the rooftops. This is the same thing, but with moving images.
That in itself would be fine, but then Ant and Dec go to meet the 'celebs' in the jungle, and they run along a small track - and hey presto they have gone from a studio to what is supposed to be the middle of nowhere!
In addition, the camera angles and camera movements are much too convenient - in shows like BB they have the advantage that the contestants are confined to a very limited space - even then, there are plenty of awkward shots. In this show though, the cameras seem free to move all over the place, there are never any mic problems (that I have seen) and yet the 'celebs' don't appear to even notice the fact that a cameraman must be jumping about 3 feet from them, when they are having some intimate discussion!
Even the backgrounds of the camp seem to suggest that there is not of DEPTH to this jungle. It looks like they have wheeled in a whole bunch of plants and made a jungle set that is quite long, but maybe only 10 feet deep.
Admittedly, there have been some shots of them all traipsing through the jungle that I though DID look like they were done on location, but could easily have been done in a forest someplace, and infact would have had to have been done where the production team knew the exact path they were going to take, to have the ARIEL camera pan along as they walked!
I can't believe anyone here can believe it's NOT fake! As for costs of faking it over the real thing - as BB showed, the phone calls will easily pay for either option, and the production company probably does not want to have to explain why they managed to kill off a celeb (C-list or otherwise) with a nasty snake or insect bite - even if it was only Uri Geller.
Admittedly I have not seen all the shows, so there are possibly things I have missed.
GtB