After the symposium, I attended Critical Mass. The organisation (such as it is) seemed to fall apart a bit, with the regular core massers being absent (possibly related to the Labour party conference).
I took the Twenty and the Yuba as I was meeting a friend in town before the ride, and he was without bike. I also took a cooler full of ice and Desperados for afterwards.
The ride in was surprisingly pleasant. Once at the library starting point I took in a lot of the bikes and started chatting to some random guy who had seen me on the Yuba before.
I was most impressed with this, a Raleigh Twenty with the 26 inch Raleigh fork and wheel placed up front. Also, it has a pretty funky paint job.
Apparently the October Critical Mass is supposed to be one of the biggest, and I intend to be there.