This is pretty much it I think - wait and see if anyone has other things.
One point I think is that this is not a car garage but a storage unit?
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I am repeating that the contravention did not occur as I was parked adjacent to the dropped footway outside my own garage.
You acknowledge this in your rejection of my informal challenge, but say it is still a contravention.
I must therefore point out that the Traffic Management Act 2004 provides for exceptions in section 86 - Prohibition of parking at dropped footways etc. and the relevant exception reads:
The second exception is where the vehicle is parked outside residential premises by or with the consent (but not consent given for reward) of the occupier of the premises.
I trust this is clear and look forward to the speedy cancellation of the PCN.