A work mate recently bought a bike as he wanted to lose weight, a full suspension, uber tyred MTB 29 'er from
Halfords. A week or so later I asked him how he was getting on, he said he hadn't ridden it yet as he hadn't had time to buy a helmet. I said he might want to have read online and see if he thought he really needed one to ride a bicycle, his eyed glazed over and I knew I'd be wasting my time pushing it.
He turned up yesterday with his new helmet, it is so large and badly fitting that I reckon he could get another one under it. Now he feels safe to ride.
PS We work together in A&E and despite seeing many head injuries every single day, after 2 years in there (one of the busiest in the UK), I still haven't seen a cyclist come in with one. Still........wish I had a £ for every clinically trained professional who has mentioned my lack of a helmet.