On retrospect, seeing the magic bus variant feels like that's shown the way they *should* have gone - have a consistent rear and sides application and use their different colours on the front where needed. I wouldn't bother distinguishing between bus and coach services though as I don't think passengers do so probably use orange for normal service vehicles, blue for magic bus and that odd green on specialist routes.
Edit I think they shot themselves in the foot with the shade of orange, its different enough to the irn bru interior orange to look out of place, but not different enough to be worth it, looks washed out to start with too, can't imagine it will wear any better - I'd darken it a few shades for the above reasons.
It still looks like a washing powder brand though, I keep thinking that when I see it. Stagecoach: gets the dirt out even at 30 degrees...