The CEO had a choice of penalties for where you parked, (1) parking off-carriageway, and (2) parking on a restricted street, because the DYLs apply to the whole road, mot just the carriageway. But for councils, they like choice 1 because there are no exemptions to it. We do see a lot of this sort of thing in B &D Coouncil who are duffers when it comes to signing and enforcing parking.
However, you've not posted the PCN, nor given us a GSV link so we can look for ourselves, sp please post them.
Councils can over-ride the 1970s London-specific Act that barred off-carriageway pwrking in London, but have to pass a resolution first, then sign where it is allowed. B&D seem just to "tolerate it" it in certain places without doing any of the proper procedures.