I took this last Saturday after exiting the station and just before being stopped by security. I always get approached by security when taking pictures in Canary Wharf!
Once again, I produced two additional exposures in RAW (+2 and -2) then adjusted levels and curves in CS3. Finally converted it to black and white then added a tonal contrast filter from Nik Color Efex Pro 3. I'm thinking about creating an action in PS3 for conversions to black and white as I seem to making the same adjustments (more or less) for this process.
The use of a fisheye lens introduces previously non-existent curves which draw the eye through the image to the top of the tower.