Cineworld WILL be showing Star Trek in 2D, they just don't know how many prints of the 2D film they will be receiving, hence why they haven't programmed any times for it yet. It was the same with Iron Man 3 which didn't list any 2D times until the week before release.
Oh, thank you!
On the website there is nothing at all about 2D screenings so I jumped the gun a bit.
Still, it's an interesting topic I think. I've appreciated the replies.