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Absolutely right to
expect a persons bike is legal
we also need to expect cyclists ride cautiously and do everything possible to avoid crashes. I don't think that the cyclist who killed Nick Bancroft was prosecuted (2007). Nick stepped out onto the road then stepped back as the cyclist tried to go behind. The cyclist's bike was 'legal' but his lack of skill/care/luck led to the same outcome.
Of course it's contrived, like elements of his defence would have been.
For me the real sticking point was a lack of a brake. I think it's fair to expect a persons bike is legal.