Thanks for video.
There is no break in the bus lane, simply in the markings as required by statute.
It confirms what I suspected, parked.
And shows what seems to be the driver taking a photo of the sign at about 23 seconds into the video?

If that is the case, I would grab the discount,
To me it shows that you may have erred due to the defective sign but not only checked the sign but photographed it.
Had you moved the motor then, I reckon a fair to good chance of a win.
But as it is, an adjudicator is going to see you checking the sign and ignoring it.
To me that is a loss.
Others may have different views.