Cars actually not too badly damaged as I was not going very fast, called last night to ask how the horse was and it had been put down on the Sunday night, when they got the vet it's heart rate was 110 and this had still not gone down by 5 pm so that combined with the fact that it could be dangerous decided its fate. I know both the owner and the vet really well so I know they wouldn't take the decision lightly.
I find that I am just being a bit over cautious at the moment, whilst out today I came upon a group of children on ponies and was terrified passing them in case I spooked a pony but I will get over it I'm sure.