What would you do in this situation?

I too would have had a damn good go at that driver (altho the tiniest part of me says at least he did stop when he saw a problem - but not enough for me to forgive!!!!) but you cant trail this out now. you've done your bit - reported him - but you have made the decision not to take him to court so really what is the point in haring him further?? he was wrong to do it but phoning him up to give him ANOTHER telling off just slips you neatly into the wrong as well i think. so let it go but i hope you gave him what for when you had the chnace and that your horse will come right quickly.