Thought I would clarify my previous post as to how cases are winnable if you have collateral points of appeal, even when the contravention is visible or not. In your case, you may wish to challenge the PCN on multiple counts, 1) there is no contemporaneous image of the vehicle passing any sign, neither the PCN or TfL's video evidence shows any sign being passed, it has not been made out in the PCN paperwork or the supplementary evidence; 2) the wording on the paperwork for the payment period and grounds on page three can be challenged (unless they have updated it). If TfL reject the representation, then sometimes there may be a wording defect in the NOR to strengthen a case. I understand the balance of probabilities test, whether the sign was there on the date, but an ANPR camera is there for a specific purpose to make out the contravention, but in this case it did not. It shows your vehicle making a manoeuvre. If you need the wording to challenge the PCN paperwork let me know, but it's only my layman interpretation and there is no guarantee if it would be accepted.