Actually, I'd like to see more detail (if it's there) in the upper right quadrant. There may indeed be nothing there in the exposure, but it's still a big blank void that doesn't balance well with the theater signs.
I like it just as it is. If there were more detail in the upper-right quadrant and it were visible, it might detract from the core subject matter. Just my $0.02. Which my wife suggests isn't much. )
*gush* thanks so much for all of your comments. TheFlyingCamera, thanks for the suggestion. However, I see London as quite an imbalanced place to live and the darker area actually reflected my feelings for my hometown. So for me, it turned out rather well