Nasty mate, at least you'll still be able to run (although you may get mistaken for a fleeing criminal and get arrested). I once did similar when I was about ten, came off a makeshift sledge we were using on a grassy hill and landed on the pavement at the bottom on my face. Bled like hell as well, I looked like a burns victim for weeks.
ps - I saw you out running the other week, just at the top of station road.