Stanwell (#9262),
Y-ess, now I come to look at it, the vertical dark lines are obviously for that purpose. Can't see that they would be any use, as you could see the holds going up and had to feel for them going down. So what about the little rectangular notices ? They seem to have some message on them - but what could it be ? (old eyes not so good for past few days).
Needless to say, all lines and notices long gone before we got them. Really, it was only the rear navs/gunners who used them, the pilots scrambled up the u/c leg and jumped down off the trailing edge.
Danny.