When I'm cycle commuting, I tend to travel late, to avoid all traffic, including cycle commuters. There has been a definite increase in cycling in more central London, which I guess can simplistically be explained, at least partially, by the July 7th bombing. Further outward in Croydon (which is were I cycle from), you definitely see less cyclists than I do when I get closer in, when I'm going to work, on a busy day I'd only see half a dozen cyclists on the first half of the journey, whereas on the second half I'd see that many on a quiet day.
What I want to know is whether anyone else has ever seen anyone else using a trailer for their shopping? I use mine regularly, but I've never seen another cyclists taking a trailer to a supermarket, or clearly carrying their shopping home.