Video shows you driving past a "Flying Motorbike" sign with no hesitation at all. Were you not aware of what this sign means ?
As this is such a new scheme, I suggest you submit representations on the lines of your narrative here, namely not local to the area, etc. Don't be confrontational, but suggest that some advance warning of the closure would have alerted you, and also it seems disproportionate to enforce the restriction that had been running for less than one month before you received the PCN, and that a warning would have sufficed.
Other aspect is that there may be a technical appeal argument based on Merton mismanagement of the enforcement process, so wait a bit but don't miss the deadline for submitting reps or paying which is 28 days from the date of the PCN. You are still within the 14 day discount period.
