In London for a huge number it's a commute that many ride as a sport. I don't see a 50:50 split of male female but it's not far off. What I do see though is a disproportionate number of white people compared to London's diversity, but that's a whole other thread ready get locked!!Same here... i simply don't do sport.
However i feel that cycling in the UK is generally perceived as sport rather than transport, otherwise so many conversations i have about cycling wouldn't become a willy waving contest about how far or how fast i go. Plus, when i'm out and about riding the country lanes in my casual clothes on my old MTB, I'm in a definite minority amongst the all other cyclists i see.