Thanks everyone for your concern.
Sam is OK - hours in A and E at East Surrey and then transferred to East Grinstead where they specialise in facial injuries. Home by 8.30!!!
he's in a bit of a mess that newly laid gravel surface acted as a mega cheese grater and ripped lumps out of his hip, back and face.
Broken arm just below the wrist - this is nasty and giving him a lot of pain - on strong painkiller and being very brave.
15 stitches in the wound on his face - huge whole, you could see through to the bone! - he's going to have a nice scar.
completely his fault - no one else involved - I'll let him explain what happened.
Jon