Other than the DVD release back in 2012 of the Great Pretender documentary, there was another version out there that has the like the different opening, similar to the trailer except the Matt Lucas bit, the different fonts, and some different contents throughout. I may be wrong, but how many versions have been broadcast?
The one on iTunes is very different from the DVD release. If your looking for like alternate footage or things like that, the dvd has everything your looking for if I’m not mistaking