Define "continuous"?
At all times an item in conveyance to/from the vehicle?
Does there always need to be part of the item or one of the people loading inside the vehicle?
If not, from what distance? What is the legally defined radius in which you are allowed to load from, before it becomes non-continuous?
How many seconds of "non-loading" counts as non-continuous?
Would it be reasonable to expect someone to have a pile of items sitting on a wet floor in the rain while they are loaded for potentially 40 times (plus the time it takes to move the transporting vehicle from wherever it was parked to the loading bay?).
What is the purpose of the loading restrictions? Is it to raise money or to prevent people from using the loading bay as a parking space?
Those 2 pictures could just as easily have been taken by the parking warden waiting specifically until there was nobody near the car for a few seconds.
As far as I'm concerned, that is no proof at all, however if that is what the legal system feels is the "correct" outcome, then I'd be inclined to feel my morals and beliefs were no longer in alignment with said legal system, and would therefore have no further obligation to abide by it (other than to serve my own self-interest to avoid punishment).
Continuous already has a definition, so I don't need to make one up or speculate about your theoretical scenarios.
I will say that I find it unlikely that the traffic warden has a personal teleportation device that instantly blips them in and out of position, so they would have been walking up and down the area in question. If they observed loading taking place but hid behind a tree and cunningly snapped pictures 10 minutes apart when there was no activity, then they are obviously very sneaky and a credit to their profession. It seems more plausible that they didn't see any loading action taking place for in excess of 10 minutes and thought yes, someone is trying it on, time for a ticket. Many people have cameras installed in their cars these days, so it would seem rather risky for a traffic warden to essentially fake the evidence.