As someone who has accidents, both with and without helmets, could one of the anti helmet brigade tell me if those without helmets are better at risk compensation, or was it just me being a twat when I received multiple cuts to my head in an off road high speed gravity testing experiment. I am quite open minded about helmets and don't always wear one, but the doctor who treated me called me a twat, and I am sure he has seen the aftermath of more cycle accidents than most. And as they say in the motorcycling world, if you have a two bob head, a two bob helmet will do. I have a 6d head obviously !