On the 12th of January, I attended a photo walking in central London.
I discover the event on Upcoming but most people were Flickr users.
The organizer Phill Price has written a wrap-up post on photowalking.org.
If you've got Google Earth and want to navigate the photos on the route we've walked, here's the Flickr link to the KML file for that event.
Below are some of the photos I took on that day (it was an exceptionally sunny day for this time in the year in London):