Obs period is not a grace period.
You parked, obs started when CEO arrived which it's reasonable to assume was after you parked otherwise you'd have seen them therefore trying to deduce the obs period from times of photos is pointless IMO.
When you returned you did not explain or communicate with the CEO but instead drove away, hence the photos.
If you are the registered keeper then once the penalty is registered at the Traffic Enforcement Centre (as referred to in the letter) you would be entitled to submit a witness statement to them on the grounds that you did not receive the NTO. The matter would then be reset to the PCN stage.
Only you know whether this notice was received and whether you could legitimately sign a statement of truth to this effect. But this decision is yours alone.
I suggest you contact the council, confirm your address for correspondence and ask when the PCN will be registered by them.
We will request the council to send original PCN as not received.
We request CEO to not issue Notice as moving car and was there for a minute but he took his device to start printing PCN and we drove away.
Our car colour was stated wrong, can this be raised in any way?
I will submit Statement of witness, the letter I received was not recorded delivery or sign for, possibility PCN/CC to lost in post.
Thanks