Thank you all for your replies!
@Misa: Sorry to hear you've been in hospital. I hope you're well now? I have multiple conditions so I know how awful it is to be ill for a long time.
As I said, we just couldn't find the cat at all. My Mum and I have just been talking about it and we both feel as if it didn't happen at all. We know it did, but there was no sign of the cat, no blood or fur on my car, just nothing. It's like that old tale about cats teleporting! When one of my cats was injured when she was just a little one (about a year), she managed to get home, yowling and her pads ripped to shreds. There again, when my first cat was killed in an RTA there wasn't a scratch on him, he looked like he had just fallen asleep.
@Lyn: It's just awful isn't it? It would have been bad for me no matter what the animal, but I love cats so deeply... I hit a Pheasant many years ago (early 2000's) and I still think of that, so this is going to haunt me forever.
I appreciate your post and the virtual hug.
@Liz: If I could have found him/her I would have gone straight to a vet, but the little mite was nowhere to be seen. Like I said, my Mum and I searched for about ten minutes and just couldn't find it. It was on the A15 and it's a very busy road, even at gone 8pm there's a lot of traffic and we just couldn't stay any longer.
@Kay&2Ts: I hope that's allI did. It happened so quickly; one moment it was in the middle of the road, the next... Well, you know. I will keep an eye on a few sites for lost & found. Part of me hopes I don't see any losts in the area as I know how devastating it is to find out your loved on has been killed on the road. That said, I had a cat go missing in 2007 and I've never found him and I often wonder what happened to him. If he had been killed on the road, knowing would at least bring closure.
Again, thank you all for your replies, it's appreciated. I'll keep you updated.