Two things: -
1. Road markings are clear enough for an adjudicator. They may not be in rain and/or darkness, of course.
2. Video shows you stopped only partially in the box, but I think too far in to make a de minimis argument.
Sorry I'm only looking at this past midnight ! However, I can't see anything to submit reps on, to be honest, although the PCN may contain errors, but I'm not up-to-speed on the Act at the top of the PCN. This and its regulations defines what must be in a PCN