Edit - the 2018 TPT case referred to has been attached and also Regulation 8 of the RUC regulations.
https://www.legislation.gov.uk/uksi/2013/1783/regulation/8/madeOK, so we know where we are now.
So, no PCN was received, but this letter then arrived advising you that the period to pay or submit reps was fast approaching.
First question is, is the address on this letter the same as the one on your V5 Registration Certificate for the vehicle ?
Second question is what are the circumstances that gave rise to this PCN ? Presumably you are aware of the Bristol CAZ ?
Finally, if you eventually do decide to take them to the Traffic Penalty Tribunal, there are three things to present in your appeal, any one of which should see the PCN cancelled on the basis of "procedural impropriety"
1. The use of an 0870 phone number for paymentis unlawful. This is because every time a PCN recipient uses it to pay a PCN, the phone service provider passes a "bung" to Bristol, (this being a percentage of the call cost). A court case some years ago held that requesting more money than defined in law was unlawful; a PCN can only request the penalty charge and nothing else.
2. The PCN is unlawful because it is demanding the CAZ toll in addition to the penalty charge. As per 1 above, this is unlawful; under the Road User Charging regulations, a PCN can only request the penalty charge and nothing else. This is supported by an adjudication in 2018, which has just come to light.
3. Their letter to you is unlawful because it is outside the process defined in law. This defines exactly what a council can send to a PCN recipient.
Any of the above is procedural impropriety and a reason for cancellation of the PCN.
The downside of taking them to the TPT is the discount option is lost if you take them there,
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