He managed to get himself home, went to call him in at bed time and he didn't come, noticed him just sat by the window so i knew something was wrong (as he always comes and answers when i call), i carried him in and noticed blood on his ear, he was struggling to walk, tried to jump over the stair gate but couldn't 
, i then spent an hour trying to get him out from under dd1's bed, he let me check him over and i phoned the vet for advice. I took him in this morning (after staying up all night with him).
I thought he had a head injury as his eye was closed and bleeding, luckily it wasn't a head injury just gravel in his eye. His back end was hit and his tail broken. He's now home and has too be caged for a week so his tail can heal, we are also waiting to see if there are any other injuries (so far it just looks like bruising). He's looking very sorry for himself and doesn't like the cage (he just wants cuddles). We go on holiday on monday so we will be leaving him with my brother who is house sitting, i'm a bit worried as my brother will be working during the day so the cat will be left on his own (i guess he will be ok as he has to rest in the cage anyway). Keeping my fingers crossed that her perks up soon and his tail mends.