Being serious, he pleaded guilty to dangerous driving, how was it dangerous driving and what would the possible alternatives a court could handed out to him had he pleaded not guilty? :-/
Once he pleads guilty the court can do very little. The court does NOT have anything to do with the charges, and cannot amend them. Had he pleaded "not guilty", gone to trial, and been found "guilty" the punsishment would have been higher...as "discount" is given for an early guilty plea.
IMHO the fault here is with a) CPS .. who seem to have gone for the jugular, probably realising the old guy wouldn't fight and b) with the defence soliciter/barrister who has not done his job properly.
It would be the defence who would/should "persuade" the prosecution that the charges are unreasonable ... blatently this did not happen...

On the second occasion it went to trial and the Jury convicted ... probably on far more evidence than that one page report !!