I'm trying to find the title a low-budget British movie I saw a few months ago.
A guy goes away to train with the Parachute Regiment in the Army and comes home to find that his brother, who has a mental disability, has been bullied in the extreme by people in his home town. His brother helps him identify all the people that have done horrible things to him. One by one he picks them off with his new training.
The film end with us discovering that his brother committed suicide as a result in a disused barn/shed and that he has been a figment of the Para's imagination throughout the movie.
Anyone any idea which movie I'm talking about?