The reminder letter does not change the POPLA deadline and does not cancel the right to use the POPLA code.
The POPLA code is valid for 33 days from the date of the rejection letter: 28 days POPLA validity plus 5 days assumed for service. So if the rejection letter is dated 17/11/2025, the code remains usable up to and including 20/12/2025. That is completely separate from whatever “pay within 14 days” wording appears on later reminders.
What CUP are doing in that reminder is just restarting their internal chase process once, in their view, 29 days have passed since the original notice. The phrases about “full payment required within 14 days to avoid further action” are standard debt-chasing language. They are not a legal cut-off and they do not remove or shorten your POPLA rights.
Under the Private Parking Single Code of Practice, once you lodge a POPLA appeal the operator must put recovery activity on hold while the appeal is being considered. They are not supposed to continue, start, or restart debt recovery or litigation while an independent appeal is outstanding. If a POPLA appeal is upheld, they must cancel the charge and cannot pursue it further.
So:
1. The reminder letter does not stop you appealing to POPLA. You still have the full 33 days from the rejection date to use the POPLA code.
2. The “further action in 14 days” is just a threat that they may escalate to debt collection or consider court, but that is stayed once a POPLA appeal is actually lodged.
3. Priority now is to get the POPLA appeal drafted and submitted before the 33-day deadline. If they or any debt collector chase you after you have submitted the POPLA appeal, that would be contrary to the PPSCoP and you can then complain.