In terms of the contemporaneous footage, the vehicle passing the sign seems to be clearly made out. With that said, there may well be points that can be challenged in the PCN paperwork, though I am unsure whether or not others here agree with my interpretation of the wording defects. If you want I can draft a short representation including a technical strategy that I recently learned on this forum. From my perspective, the best course of action would be a collateral challenge intermixed with other points of appeal to see if the council make an error in response, that may help build a case in the event you wished to contest it all the way. Do you have any mitigating circumstances or disability that put you at a disadvantage. Are you able to revisit location to film reconstruction footage with iphone by safely walking along the pavement showing the sign at the entrance of the road then walking a few moments to the pedestrian zone sign.