Can't think of anything better than the below. See if anyone else has anything. NTO date is 13 October so still nearly 2 weeks to go.
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I repeat the points made in my informal challenge that the contravention did not occur.
I am disappointed you did not address them in your rejection, which seems to be a template and does not meet your duty to consider.
To repeat:
As evidenced by your CEO's pictures, I parked on what I could only see as an unrestricted extent of the carriageway. There are no marked parking bays there.
I see the CEO took a picture of a parking sign but on checking Google Maps this sign appears to be facing in the opposite direction to the road!
As no mandatory traffic sign and road markings were there to alert me to a parking restriction the PCN must be cancelled.
And I made a constructive suggestion that you task your CEOs with reporting defective parking restrictions rather than issuing non-enforceable PCNs.
This time I hope you will properly consider my representations and cancel this PCN.