Twilkes does at least work where someone's concerned with his welfare.
My views on helmets are in previous threads so I won't repeat them in full, I'll just say that in cold weather they're quite good for keeping the head warm and a scarf in place. In Twilkes' case if he's neutral over using a helmet it might be better to appease his colleagues.
I'm not interested in anecdotes , and that includes from A&E consultants. I can come up with a very good one of my own, but won't here (again see earlier threads), relating to an accident resulting in multiple fatalities, to illustrate how a helmet could kill. Irrelevant as it's anecdote not evidence. Neurologists, who end up dealing with some of the nastier results of accidents, don't all agree with helmet wearing.
One day we'll see someone doing some research and design work, and end up with helmets that don't have protrusions and extensions to catch on the ground and twist rider's heads off. I notice that BMX helmets are smooth and round so they can't catch and snag when a rider comes off.
We could all, of course, buy made to measure helmets with honeycomb aluminium shock absorbing material in them and a visor for eye protection, just like the pros use. Trouble is the starting price of £1500 (or so I've read).
In the meantime we all come under more and more pressure, mainly from ill informed judges and politicians and from insurance clerks who drive to work, sit down all day, and haven't been near a bike since they were 17, to wear a device which has no overall benefit (according to real research).
Cycling is very safe. The chances of getting a non-superficial head injury in a lifetime of cycling are minute. Helmet's aren't even sold for many activities more likely to result in head injuries. Sadly that's the reality but not the popular perception, even among many cyclists.