Firstly, you were parked adjacent to a dropped footway, in this case the vehicle crossover into the gated area and warehouse areas. This is also a contravention. But luckily for you the CEO chose the alternative contravention of being parked on a 24/7 waiting contravention conveyed by the DYL.
If the CEO's observation of 14 minutes was continuous, then IMO you'll struggle with your 'unloading' exemption claim. But you should at least make initial reps, however I think you'd need to be more expansive about exactly what you were doing between 11.37 and 11.51.
