That satellite picture is probably from a while ago. The lines may have faded even more now, if they were there.
As for the double yellows, would they not apply to the carriageway, as opposed to the lay-by (or whatever it's called). Also, if the box does really end towards the left, what then becomes the designation of this Eastern part (where we had parked)?
It's evidently not pavement.
Therefore, would it not basically be without any sign and hence cannot have enforcement?
I don't know if that's an official thing, but I've heard before that if the sign for a particular bay is missing then they can't give you a ticket....
So, the big question is, what's the best way to appeal?