I believe one of the worse movie have ever seen.
Terribly directed. A good example of what not to do. If the music shows some interest, it was nearly impossible to hear the dialogs because of the poor quality of recording.
I imagine that, the first thing to do if you want to make a movie on that topic, is at 1st to be familiar with England, the ways people chat, their sense of humor.
Then, to find a coherent casting...
Then, to study how to film, the balance the framing, in the order to reach the effects you want to create.
Just a want to be something that failled on every single point