I took this ones a couple of years ago. Night time city light are very difficult to photograph. There is an overall orange colour cast, a mix of different light sources, each with it colour temperature, and pictures can look quite weird initially. I tried here to experiment a bit with white balance adjustments and colour curves and this is the result. From that walk in central London is also this other picture, that somehow, I think it has a bit more natural look.
These days it’s been in the news something about how the orange light in a city like Los Angeles has been an important detail for portraying that city in a huge amount of movies along the years. It seems that they want to change the street lights and that will change completely how night-time photography in that city looks. There is an interesting post here about this.