Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

one of the reasons I don't wear one is because drivers tend to give female cyclists more space, and you look more obviously like a female cyclist if you're not wearing a helmet

yeah but it's not the car that sees you that's going to crack your head in the first place...

It could well be the car that sees you and misjudges the amount of space you need.

There are plenty of other arguments anyway e.g. helmets would have little to no impact in nearly all serious collisions involving cyclists within London (because they're mostly fucking HGVs)

I do generally wear a helmet for road rides outside London.