The title of your initial post is "PCN for Camden no entry (disabled vehicle)".
I assume you mean you have a blue badge? Was there anything that led you to believe that a BB holder was exempt from the restriction?
The vehicle is adapted for wheelchair use and was carrying a disabled passenger who holds a BB.
We didn't think it was exempt, it was just hard to spot that unexpected sign with the ongoing roadworks all around it. Ironically the intention was to turn left onto Howlands street anyway as that's what the satnav wanted but it was blocked by works vehicles.