BA probably just use it as a way of filtering out applications of the system. Unfair true, but that's life!
I have been wondering though - on the 757 I have to have the seat as high as it goes to be comfy and achieve the correct line of sight as per Boeing. I'm 5ft 9in - so what do people shorter than me do ? Or do i just have long legs and short upper body ??? I don't think i'm that abnormal as i passed the size fitting for the RAF :-)