Thanks Graham, your reply has given me the confidence to proceed with sky undersurfaces.
Also, even though I’m not planning to build one, the subject of meteorological Gladiators raises an interesting point. There is a published photo of one in late war fighter camouflage, which confirms the AP 2656A that you guote. However the photo is taken from the rear, so the question then becomes, were such biplane wings painted with yellow leading edge strips like all other fighters? They should have been, if the AP instruction was properly followed.
I’m still surprised how very few post 1941 Gladiator photos there are, given that it was a fairly numerous type which remained in service until 1945.
Thanks again, Phil