My tuppence-ha'penny worth: (which is not legal advice)
Displaying the ticket visibly will either be in the terms and conditions, or it will be implied into the contract on the basis of business efficacy.
What isn't clear is whether the signs warning you of clamping as the sanction are visible enough to imply this into the contract, since this could be viewed as an onerous term. As a general point, that would depend on each individual station. Of course, if you start admitting you knew you could be clamped for contravening the T&Cs, then it doesn't help you anyway...
Your best hope is to get them on the radio, make them seem unreasonable, and that will hopefully make all the law go away.
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