I also posted a thread onto MapCore to ask the opinion of other level designers. This thread can be seen at the following link.
The general feedback I gained was that I had too much happening in the level. With the crashed cars, drained canal and smashed scenary. Although I don't see a huge problem with this, it is definitley something I want to keep trying to weave clearer narrative elements into my environments. This feedback has made me more aware of this issue in my designs and is something I will keep in mind when developing the detailing of my next project.