OP, as you have time can we sort out who's who and what's what pl.
Your first post states that your Dad was driving, but subsequent posts refer to 'I' from which I infer you, not your Dad.
Who submitted the informal reps and to whom is the council's reply addressed?
This makes a difference because a NTO is sent to the registered keeper and only they may submit formal reps. So, who is the RK and are their DVLA details current?
The photos. Are these yours, the council's or a mix? As you've deleted the VRM we cannot look at the council's photos, you might reinstate the VRM as this will make life easier as the matter progresses. It is important that if there is a council photo(s) of the BB on the dashboard that we see this.
As regards any possible request for the CEO's notes under GDPR(I'll take advice as to whether this even falls within its scope because none of this could refer to an individual but rather an unnamed person or a vehicle), this could only refer to the driver and therefore if the RK was not the driver then they could not make such a request on the driver's behalf.
Just some details to be clarified before a NTO arrives.