Hi Jools,
There's a nice symetry about this shot and the exposure looks well balanced, especially when I viewed the slightly larger version in your gallery. There are some very powerful shapes within the structure of the building and my only suggestion to possibly enhance it further would be to define those shapes a little more strongly. I feel they need to display a bit more dynamism, to give the image a greater impact and give it a 'Wow' factor. Otherwise, I think it's a great composition.
