I loved Black Museum, but the first two premises (the pain/feeling helmet thing, and the drafting a coma victim inside someone elses head) have both been thought up by Karl Pilkington (although as
@Dan says I don't think he was the only inspiration). Makes me wonder if Brooker has listened to the podcasts...
edit -
here it is. This episode, Karl comes up with a film idea with Clive Warren (Owen) as a man who gets hit by a truck and put into a coma. His girlfriend is then approached by a doctor to put his mind in her head - hilarity ensues.