Headkayse: the bike helmet you can drop (or hit) and still use

British start-up firm says its revolutionary design offers a more robust and effective helmet. But design niggles remain

Let's begin by forgetting the usual tedious arguments about bike helmet use - you can do it; close your eyes, count to 10, breathe - and instead focus on the more minor irritations concerning them.

For someone like me, who wears a helmet the majority of the time when on two wheels, it's mainly the care you have to take with a cycle helmet, not dropping it on the floor or, if you have it attached to a bag, bashing it against things.