OK before it degenerates with people reading too much into what I wrote down. Which was him explaining his opinion to me like I'm 5. He may very well have the evidence for the case for wearing helmets at high speed and whatnot, but you can't link stuff via someone else over the phone.
I will speak to him tomorrow in real life and take notes this time. That's if he wants to talk about it, he may not, not because he's cross with anyone, he's a sweary man anyway, but because he was very clear that he just won't care if you were wearing one or not when he arrives on scene and would treat you just the same, also that he can't stand it when people try to make this sort of thing mandatory because we should all have freedom of choice.