Hey there he is! Ha! Thanks for posting this, I missed it when it was on.
Thats Steve Swales, the head head head head...head guy at tussauds. I was lucky enough to work with him and get some coaching from him in my time there. Great guy and an amazing artist. Such a great deal of method in his work.
Infact I was there when he was sculpting this over a year ago now I believe. The sculpt in the video will most likely be fibreglass, like the show models they do for the behind the scenes section of the attraction.