In reply to Timmd: First response was,yawn.
But to add grist to the mill,I took out a small chock below the overhang,as I noted several people were pulling on it to get past the roof section.This was no big deal as hex 10 and 11 fit that section.This was in the late 70's.As the photo shows,Brown's rope is definitely held in to the crack by something,presumably gritstone chocks.
As I pointed out before,not everyone in these minimum wage days,can afford large cams at 70 to 90 quid a pop.
I guess the stone chocks will go in and out of the route as people demonstrate their sense of ethics.Brown had them,judging by the photo.
I don't see why only the well off should enjoy leading the route.