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On what basis did they reject your appeal please?Alex
Thanks. Sadly these are private fines and can be enforced due to a recent decision at the Supreme Court in London with Parking Eye.
However if the appeal failed then you can complain to their professional body which is the Independent Parking Community: https://www.theipc.info/
They may also be able to consider your complaint. The only downside is that you were not displaying a full valid ticket - this may be where your case falls down.
If you refuse to pay they could take you to a small claims Court. You would then have to convince a Judge that you are not liable. Hopefully, if it gets this far, the Judge will take a common sense approach.
Can I clarify anything for you about this today please?Alex