It suddenly occurred to me that I'd seen removable magnetic signs on other vehicles, and maybe I could make them a temporary one they could use for the time being. I found magnetic sheet online, and then began the fun of working out how to do it, as the surface is shiny vinyl which won't even take a pencil mark, nor would most paints adhere well to my little test piece.
Next will be a big boxful of their luscious veg painted on another panel to go alongside one of these on the back of the van, more a proper illustration than just one carrot. This should be done before the end of the month when deliveries start up again after their very short break. Watch this apace, and if you're not too far from Plumpton you can order your box here!