Since the really duff polycarb stuff got weeded out years ago just about any helmet will do a better job of protecting your head than your neck will do at keeping it attatched to your body.

Annoyingly, if you hillclimb, MUK (the artist formerly known as the MSA) demands a FIA spec helmet ..... any bike shop will provide a quality helmet (nicely graphiced) to ACU gold standard that will allow you to bike race and fall off unprotected at 150 mph and rattle your head up the road ..... to hillclimb your car strapped into a full certified roll cage with a six point harness you need the FIA spec helmet at three times the cost (and no graphics just plain at that price) ..... go figure?