Hi Urby, You're being given the right royal run-around! If your solicitor, on your behalf, requests evidence that your accusers are relying on relating to the accusation and subsequent investigation of a 'crime', then the crown is duty-bound (by law) to supply it!!! ! I'm going to guess that your solicitors fee makes this a point of principle for you rather than any motive to save yourself a quid or two, but you've come this far! If you're sure you weren't speeding and are happy to take the legal costs, then continue to be tenacious until they actually prove their point!!!!! What was that they used to say back in the good old 20th Century... Innocent until proven otherwise.
Anyway, apart from this cr@p, I hope you and those around you are well?
Cheers, Miles.