But was all of your vehicle in that bay ? PCN contravention time is 12.11, so within the allowed loading period, but you have to be in the bay to comply. If any part of the vehicle is on the single red line, then the loading exemption doesn't apply.
So why not phone TFL and ask for the video. It is sent FOC and enforcement is suspended for 2 weeks. Are there any photos on the TfL wedsite ?