Hey, that looked kinda cool, i did not realise they had a new exhibition, im a frequent visitor to NHM, such animatronics, i think are wasted on people my age,(we know better) however it's great for the kids.
I sincerly hope you gotta chance to go on the tour of the Tank room dowstairs, in the Darwin Centre, a couple of months ago i got permission as an Artist to sketch, a newly found Giant Squid they had down there- (HEyuuuge), it also stank down there, but it was a curio luvvers dream with tanks containing some animals and marine life that are practically aliens to most of us -(Oar fish!) , they also had some of Charles Darwins first specimens, The squid in question was around 7metres in lenght, it had teeth on the suckers!
well if you go again, check it out- Carmen, head curator at Marine biology is the person to ask to get permission. 