As far as I know it's a guy in a costume, there are rumours about the head being animatronic but I haven't seen it move or do anything fancy

If it is half and half, then it will be built within the head of the suit as I am sure the beast moves freely on the projected platform.

Technically speaking, the transit system is incredible, and couldn't have been done any better, making it by far the best part of the experience. However I can't help but feeling that the story is actually pretty weak and isn't interesting.
So, in VR 1 you're given the story that Sub-Core Energy are fracking to get more fuel, and it's quickly infecting people.
Whilst I don't enjoy the story, the way it's executed isn't exactly better. As a guest, I don't want to be told a story by someone sitting next to me- I want to see it unfold. I don't want to be told that the gas is infecting people, I want to figure it out by seeing the infected people do their thing. And yes, at one point an infected person does appear- but by that point we've already been spoonfed a story that isn't that compelling. This part remains untouched, however the new headphones mean you can hear lines that were previously inaudible.
So then we get evacuated off the train into a modern tube station, despite previously being in a dark Victorian one. The idea of thinking you're in one spot and appearing in another somehow is fantastic, however little attention is drawn to it, meaning guests usually miss out on the main illusion. The live action section itself feels really weak when compared to the original- ever since Fright Nights it's been missing that hectic, intense feeling that it opened with.
VR 2 is where the real changes come into play. The new section was filmed with a 360 camera, meaning that most of the CG is gone, making it so much more convincing. However what actually happened in this scene felt pretty dull. In a nutshell, the demon comes onto the train and taunts the guests around you. It quite literally felt like a 360 reaction video, seeing as all the demon did to us was go ROAR. I understand that it's hard to make guests feel intimidated by a CGI monster, but it could've done so much more to frighten us. Also, the biggest issue from the original is still present. We're given the story of drilling and infected people, for it to suddenly be swapped out for a monster story. Whilst the demon is mentioned in earlier parts of the ride, these references are really subtle and easy to miss out on. We're expected to care for something that just appears randomly.
The ride ends in a similar way to the original- the train is torn apart and you fall into hell. It's a shame to see that the real train doesn't shake as much as it used to. Also to note the video randomly cuts to another part of the scene altogether, making it feel really disorienting.
Once you've taken your headsets off, a video of Derren Brown plays explaining how you "haven't actually moved". However most guests are busy comparing experiences, so it's really hard to hear Derren explain it. Maybe if you saw it in the VR world before taking your headset if it'd be better.
It's such a shame that the ride suffers from a lot of these issues, it has so much potential to be an interesting, creepy ride. Whilst the ride doesn't scare me as an individual, there isn't much else to the experience that makes it enjoyable. The story could also become outdated pretty quickly, as certain political parties do wish to ban fracking. It has so many good ideas, but unfortunately I can't help but feel that the negatives outweigh the positives on this one.

PreShow: The pre show was good and felt a nice connection to Derren's use of explaining what you will experience and what to expect and why it will happen. The projection was good and was presented well. Felt very realistic like he was in the room

Warehouse: Next was the warehouse and the old carriage was fantastic. it looks incredible and looks so authentic. Inside looks great aswell really grasping the tube look and vibe. 

First VR Experience: This is when i experienced my first problem, the vision wasn't aligned properly with my vision so i was constantly looking down to face forwards. Besides this, the Graphics were decent enough, i had the old man with a dog (Think it's different from the derren brown character) Which was the same as my group of friends. 

Live Action sequence: This was probably my favourite part of the ride. The acting was done well and the scene played fantastic, we had the train come and crash into us and the sequence was very realistic it did generally catch people out and scare them, we were asked to run back and the run to a new station, i think it was set out well and the effects were working perfectly.

Second VR Experience: Again, another probably, my headset was broken physically, the left ear piece was hanging off, before i could alert a staff member the sequence had started, i tried my best with what i could do. As well as this, the strap to the headset had snapped so i was physically holding it together. This time the Vr was set in a scene on the carriage with other users, this was a big positive as it felt like you wasn't sure on reality or fantasy. It did provide some jump scares and again graphics for the demons wasn't great. But again, it was good.

Ending: I don't want to say too much but it was really good, really enjoyed it and felt like it fitted.