In reply to Emilio Bachini:
From what I gather:
The Route of All Evil was first climbed by George Smith in '83, then repeated by Basher Atkinson, who did a harder direct finish and called it The True Path. Then in '91 a direct start to True Path was added, called Eraser Head. So now the direct starts and finishes of Route of All Evil have been combined to give Eraser Head/True Path.
Mid Air Collision ('91) was a new direct lower half to Flight Path ('86). Lots of slightly easier lines and variation finishes weaving about on that face, now straightened out to give more sustained interest basically.