Tom Hooper: The truth about this film is that it has a very fragile ecology, in that it is a film that begins with a speech and ends with a speech. I lived intimately with the fear that it wouldn't be climactic enough, it wouldn't be emotional enough, that somehow we'd be on the wrong side of the fragile ecology of the film. And even judging the stammer - so many pitfalls. It could be comedic. And even if you laughed at him only once, that would be completely misfiring. It could be so painful that you don't want to stay in the cinema.