neilcharlton
For a person who has been posting since 17 Feb 2006, it must appear that you either don't watch the forum often, or are blind when you do.
There is a gentleman who often scribes here, but not of late, who would be an excellent reference in matters 'Grand Canyon'. I follow his scribes with some reverence.
There have been at least a couple of threads on the subject (at least) since you were a newbie on PPRUNE.
I do suggest, have a good look about, peripheral awareness you know old boy, lack of it and you may die, or be kicked in the backside, as you deserve, until your bleeding bloody nose bleeds.
have a nice day.
tet