Reading your narrative it seems to me that basically, you chanced your arm hoping a CEO wouldn't pass by in the short time you were parked, but lost. Frankly, contraventions like yours are very difficult to overturn based on the contravention, but sometimes there can be a 'technical' appeal based on council mismanagement of the enforcement process that has nothing to do with the contravention itself. If our expert sees something, I'm sure he'll be along soon.