I started slowly skimming through the pictures I took in Birmingham at the time of Guadec 2007. The choice is hard, more because I'm somewhat unhappy with what I produced. Clearly the 50mm f/1.4 is not always well suited (even less with the 1.6 crop) as I would benefit from a wider angle.

Here is the first favorite:

The Bull Ring in Birmingham, July 14th 2007 Canon 20D - EF-50mm f/1.4 - 1/125, f/7.1 @100 ISO