Basically when you get there, say your ok & sign your self out, or, just skedaddle & out the door
Never been in that position before, but if your in your own clothes and not in hospital gowns and what have you, they won't even know you, and it'll save them a job by not having to treat you
They always inform your next of kin whatever your age. <br />
If you have been in an accident that has caused you to be knocked out or even pass out they call as soon as you reach the hospital usually.
Well people usually carry some sort of ID on them, and they will have your Medicaid on file because its the NHS so they would be able to find out the information from the ID and using their systems in the hospital.
They will have all your files from you local GP etc so they would be able to find out somehow.
However it's not always the case, sometimes they can't find out the information; but if you were to pass out you would usually be in over night as a precaution and then usually someone from your family would wonder why you haven't contacted them all day and night and would wonder where you have been so your family usually start looking first instead of the hospital finding out.
If you are considered a minor then they will call them.