I am the registered keeper and owner of the vehicle involved.
Today received a letter from Trace Debt Recovery (on behalf of Alliance Parking UK LTD) saying their client has written to me about parking charges, these are unpaid so it has been passed to them. The parking charge notice is listed as 22 April 2022.
No PCNs have been received for this location in 2022 or more recently. The vehicle keeper address has always been the same and at the current address - so this was definitely up to date in April 2022.
I am unsure how to proceed - whether to contact Trace or Alliance - are they allowed to do this when no PCN has been issued in a timely manner? And I am pretty certain that the driver will have paid any required parking charges, though that's going to be tricky to prove after so much time and cash payment.

- hopefully link works to the letter.
Thanks for any help/advice