It's a very difficult one. If the jury were made up from people on here, the result would be different. But a normal, balanced person who had never ridden a bicycle on our streets...
I fear that for that "normal" person, the argument from the defence of simply that will always win the burden of proof test would be: "The driver saw and was aware of the cyclist. They moved to leave a space. NO contact was made. The cyclist did not fall over or have their journey impeded in any way. The driver drove as any competent driver would. I suggest a non competent driver would have not seen, collided with, or caused the cyclist to fall off"
No, I don't agree with it - but I can see how a defence could quite easily use that argument every time to win a case of this matter.
The solution now can only be to lobby for something measurable and defined - a true "minimum passing distance" for example, which would have its own issues - however under the current system I personally can't ever see a successful prosecution for a close pass that doesn't cause a collision - regardless of whether you and I know of it was dangerous or not.
I'm puzzled as to why the prosecution was for Dangerous rather than Careless or Inconsiderate Driving.
Given the definitions and, in particular, the examples here>> http://www.cps.gov.uk/news/fact_sheets/dangerous_driving/ , the facts (as given) would seem to better fit Careless/Inconsiderate