About 4 years ago, on Old Street, I knocked down a cyclists while riding my Ducati motorbike. It was quite heavy traffic so no one was going fast, the cyclist had no helmet on and was weaving in and out to get through the traffic. I was going down the outside of the traffic very slowly and the cyclist just weaved to the side right in front of me and I went straight into him.
He was fine, it could have been a LOT worse. He seemed oblivious to it. I went ape shoot at him for not having a helmet on, and for having earphones in. Before then I didn't have an opinion and when I cycled I would wear earphones and listen to the news quiz or just a minute podcasts (I'm so rock n roll!) but not any more, it's too much of a risk especially in London.