You just are not getting it are you? It's about the machine, if it is capable of breaking the rules under rider control, it is always illegal on the road since it is a motor vehicle subject to motor vehicle law. Whether the motor is switched on or not is immaterial, because the law is not about the riders actions, only the machine.I'm not struggling with anything yet.
I'm starting to struggle a bit with that answer.
And now I'm definitely struggling.
Your other puzzlement about bicycles having no speed limit is simply due to an omission in law. In the early days of the safety bicycle they were never ridden at above about 10 mph in sedate Edwardian fashion, so no speed limit necessary. But the new fangled cars and motorbikes soon did need one, so a law was passed for them.
It's not been thought necessary for bicycles since for most of their 130 odd years they mostly haven't been ridden very fast. The UK craze for a lot of cycling at 20 mph or more is both very recent since the 1980s and very local to us. The rest of the world is mostly much more sensible.
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