The location of the light and its impact on these comparatively flat colours also makes a massive difference to how they appear, and perhaps that is partly because the light isn't being used creatively in a total image - and the sun is also very low at this time of year making things a little trickier.
This painted beach hut door was the setting my camera chose and comes closest to the colour circle, and the two below respectively over and under exposed by a stop. The range this creates is quite astonishing.
Another beach hut door and again the camera setting exposure comes closest to that in the colour circle. When the spring comes I will be able to find a massive range of green occurring naturally.