Ok so I went onto this I'm a Celeb today...
We got there at 10:50, and she said it'll open in 10 minutes, and we were the first ones there. Then she said there's another 15 minute delay, that was alright. Then she said there was another delay which she wasn't allowed to explain to us, and we ended up waiting for about 40 minutes. I know we could have left the queue, but I wanted to try it.
Anyway the "maze" was pretty atrocious really. Felt rushed, the actors were friendly but most seemed uninterested. It didn't feel immersive either for me. You could see the real ceiling above the theming as there was light spilling everywhere! The rocks on the glory hole part were nice, but again there were parts when you could see just plain black walls next to them. The scene with the question tanks was lame too. There was literally one question, I got sprayed with air, and then told to get out.
Worth doing if there's no wait but don't waste 45 minutes of a 7 hour opening.