wideboards:
You're far too sensible(joke). I had personal experience of a very similar thing only a few weeks ago and, without going into the initial "cause", another driver saw fit to blast his horn at me, mouth obscenities, and roll down his window to thrust his middle finger up in the air at me. His car was in front of mine but all I did was shake my head and grin at his extreme intolerance. He continued mouthing and gesticulating until he disappeared in a different direction.
Ramz:
You don't seem to have told the whole story. I say this because you seem to say that after both of you pulled over, the only other thing to happen was the other driver phoning the Police who then turned up. It simply didn't happen like that, did it?
There had to be other things which went on, because had there not been, you wouldn't find yourself charged with a relatively serious public order offence. Especially if, as you say, there were no witnesses, just his word against yours. And you cannot claim that either of you would have been calm and collected after what had happened?
The CPS would not be spending public money on the basis of what you've described, there had to be quite a lot more to it.
You must accept that you, by blaring your horn at the other driver, initiated the whole incident. What were you thinking of? You've admitted having a newborn baby with you in the car while you're blasting away with your horn and cursing at this other guy, whose actions I don't condone either. He also acted like a prat by the sound of it. God knows what state the infant was in?