Frankly if the CAA are being misleading thats a worry for anyone facing a prosecution by them. as undoubtedly the Judge or Magistrate will draw an inference on sentencing from the published figures from the CAA. It does make an overt statement of "We only prosecute if the case is beyond defence and we always win"
To the best of my knowledge there are no formal guidelines for sentencing CAA matters, as is the case in many other criminal matters, including motoring offences.
Guidelines to download - Sentencing Council