So, I've just driven down that road and if you turn around on street view there is two more 'Disc Zone' signs before you get to the left turning and another one before the next left turning. So another 3 signs within a 20-30 second walk.
That's not how bay signs work: signs in another bay don't count, as different bays can have different restrictions. There must be a sign for relevant bay, visible from where you are when you get out of the car. If a sign is within sight you have to go up to it to read it, but if it isn't visible at all you're not required to walk up and down the street looking for signs.
Could you get us a photo from
here, but as if you were standing by the driver's side door of the black car seen on google street view?
If as I suspect the sign for the bay is wholly out of sight, then there's a case to be made on the signage and I think we can get the council to commit a procedural impropriety as well.
As for the permit, that was a bit silly of her but it is what it is, so we'll have to go with a technical appeal instead.