Sorry for joining this late, I'll go off topic a bit to begin with then come back onto the subject I promise.
Cunobelin wrote:.. and the compulsory use of cycle paths, paying of road tax, getting off the road altogether?
The CTC is absolutely correct to remain in a situation where it advises that helmets are not the magic bullet" that some helmet evangelists believe it to be.
I commute in a built up area and cycle paths on the pavement are pretty awful; I avoid using them for the safety of myself (from cars pulling in/out from driveways) and zombie pedestrians. However there are occasions when they are safer; so I like having them there as an option.
Unfortunately some drivers do get agressive when you are on "their road" and not on "your cycle path", but they get my standard response in times of conflict

Road tax is paid by everyone, that's a separate matter, but my personal view on car tax is just scrap it, it's a waste of resources to administer and police it, just increase fuel duty instead.
TV tax is another one that annoys me, but I won't go into that

Coming back onto topic here's my personal view (for what it is worth):
For insurance purposes I wear one, but when courts etc stop taking them into account (I can dream) then I probably won't.
They are a nice comfort blanket and (sometimes) I do feel vulnerable without one, but that may of course mean that I am less careful when I am wearing one, so I don't know which is worse, nervousness or over confidence?
As far as I am aware cyclists have very few accidents and head injuries are in the minority of these very few. If I am wrong about this then please correct me with solid scientific evidence.
Minor injuries happen to us and throughout my life I have had knocks and scrapes but my body is amazing, it can fix itself, sometimes with medical help, but non the less I am made to endure cuts and scraps.
If I'm more likely to die in my car than I am on my bike (regardless of wearing a helmet or not) then surely all that matters is that I commute to work on my bike? Surely this advice applies to everyone: Cycle (helmet or not) and be less likely to die than in a car?