Free Traffic Legal Advice

Received PCN as a registered keeper from Nexus group at the above hotel in Glencoe, Scotland. Apparently stayed on the car park for 40 mins. There was no signage that could be seen or pay and display machine on the car park. The car park was used to access the public showers which the hotel as offered for a number of years, to which they have never had parking charges for.
I have since found a photo from Google reviews showing the signage which is there. As you can see from the photo the signage only has an option between 1-2 hours, nothing less. Meaning there should be nothing to pay anyway?
The only way to pay for said parking is through an app, though as you can imagine being in the middle of the Scottish highlands there is no signal to download and pay for parking through said app.

An appeal has been made to which has been rejected. I have attached a copy of this email also.

Please could somebody advise on how one would proceed from here?

Many thanks for your help.

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