Is there any we can get stock from the USA or Australia? The reason I ask is that even though the model of helmet may be the same, because the Europe/UK safety test is so slack, manufacturers cut costs and materials for the market here.
I was formerly the US importer for a top notch European helmet brand and I am comparatively well-informed about helmets and what you are saying is simply not true. The US, Australian and European standards are all different and nobody can make a general statement that one standard is better than another. They all favour different attributes. The American standard is designed for the type of accident that would more commonly occur to a child falling off a bike. The European standard more reminiscent of that which would occur to a racer falling. It is not such that all American approved helmets will pass the European standards or that all European standard helmets cannot pass the American standards. Indeed often the only difference between the two is the certification label.
From my point of view, your average cyclist is best served with a helmet that is well-ventilated and light-weight and passes one of the certification standards. Overheating while riding can frequently lead to the bonk or to poor decisions. Wearing a heavier helmet will accelerate your head more than a lighter helmet in the case of a fall. All helmets should shatter if the impact is great enough, this is precisely what they were designed to do.