Ok I've asked someone who should now about these things, and the answer is:
"I don't know, nobody knows - no records were kept and the colours were lost" :angry:
according to a best guess the sphinx is placed underneath the roses and thistles, and the scrolls (if there were two) were either side.
Apparently we know more about what a roman legionary wore, or what a saxon king from Essex looked like than we do about the colours of a regiment from less than two hundred years ago - this annoys me.
Anyway, enough ranting about lack of a sense of history in this country, this is the start of the painting, tell me what you think so far.