In their defence, I think Halfords, Decathlon (if they sell them), Go Outdoors (if they sell them) are selling into a market where there is a ready demand. I'm pretty sure they followed "hover-boards" in terms of interest from younger consumers. There are many practical reasons for children having access to e-scooters.Halfords in particular are being utterly cynical in my opinion, knowing owned ones are always illegal in public but obviously attempting to enforce e-scooter legality for all by swamping the roads with them to achieve a fait accompli.
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I don't know that's true of some of the high powered ones I've seen, with e-scooter users going faster than the other road traffic, as if they were riding an unregistered motorbike, which I suppose legally, they are.