It's where Watson and Crick announced that they'd discovered the 'secret of life'. :3
In fact I know the site at 50:00 far better, it's the Centre for Mathematical Sciences where some lectures and supervisions (personal tutorials) are held, and where all the maths pros do their research. The roof of the main building is in the shape of a bell curve, and everything has some kind of geometric meaning... then when you get inside you are quite liable to be held up for about ten minutes every few paces, because they have displays of these awesome mathematical objects (representing groups or topology or whatnot). It's pretty sweet.