The
map tile says no waiting 7 pm to 7 am (which is the restriction we're concerned with).
It also says that the rest of the time the bay is a shared use business permit / pay and display bay, which matches the photo in the opening post.
The plate above the yellow no waiting sign is not a TSRGD authorised sign and the traffic signs manual says the sign at the top should be the yellow one, but that's thin gruel for risking the discount (but we're not at that stage yet).
I'm toying with a couple of ideas, would it be possible for you to go back and get some updated photos of the road markings? I can't see any bay markings at all in the CEO's photos.