Realistically, does anybody believe that this film, no matter how well made and meritorious it may be, at best will do anything other than achieve mid level box office sales in the UK, possibly in time even win a "minor" British film award or two for costume or screen play or such like, and do reasonable business later on as a cult movie with home video sales/downloads?
And in the US? Hardly likely to even raise an eyebrow, wouldn't you think? Can't see millions flocking to theatres in the US to turn this movie into a box office blockbuster like Fame or Flashdance , do you? One suspects that, because of the very Britishness of the subject matter, Americans simply won't "get it' ... just like they never "got" The Jam, for example.