This becomes a very complex question, with regard to the Boris helmets, it reminds me of Thailand, where they have started enforcing the requirement for helmets on motorbikes over recent years. There is a big trade in motorbike taxis in Bangkok as the traffic jams are horrendous, so the passengers are allowed to ride without helmets 
There's a lot of theories about helmets and safety in cycling, ranging from the rider getting too confident to drivers concluding that the lycra clad idiots with wrap around glasses and helmets deserve what they get.
In reality these days a helmet is only useful when striking a relatively sharp solid object like a curb. I've always felt lorry drivers should be in a glass cab protruding well in front of the vehicle to aid visibility

There's a lot of theories about helmets and safety in cycling, ranging from the rider getting too confident to drivers concluding that the lycra clad idiots with wrap around glasses and helmets deserve what they get.

In reality these days a helmet is only useful when striking a relatively sharp solid object like a curb. I've always felt lorry drivers should be in a glass cab protruding well in front of the vehicle to aid visibility

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