A great summary - https://thecyclingsilk.blogspot.co.uk/
There is no record that Alliston had his own expert to give evidence or that the risk of tipping over the handlebars was considered.
Interesting
Alliston obviously had no danger of going over the bars due to braking. Am assuming that must have been in reference to the potential stopping distances quoted by the prosecution's 'expert'.
@Miitch started
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A great summary - https://thecyclingsilk.blogspot.co.uk/