[PMoz99]

Yes Graham, that's an interesting shot. Looks like a tricolour upper surface with red codes and numbers. If the codes are red, then the base colour for the upper would likely be pale grey - medium sea grey, I think. 18 months after what I'm looking at, though, so still can't be sure if it's relevant or not. I'll keep looking, but I think I might go with the stone/earth/night and flip a coin on whether the code is before or after the roundel. I'll probably go after. Red or black? <sigh> Too may guesses here!
Cheers