You have redacted the dates. Please tell us the date of the incident and the date of sending of the NtK.
However, irrespective of that, the NtK is not PoFA compliant. This is good for you as long as you do not identify the driver, inadvertently or otherwise. The
unknown driver is always liable.
If the NtK had been PoFA compliant, they would have been able to transfer liability from the
unknown driver to the
known keeper. As it isn't PoFA compliant, only the
unknown driver is liable.
There is no legal obligation for the known
keeper to identify the
unknown driver. Hence, you have what we call a "golden ticket" as long as you keep shtum about who was driving.
Appeal with the following (verbatim):
This is an appeal by the registered keeper - No driver details will be given. Please do NOT try the usual trick of asking for driver details in order to get around the fact your NtK does not comply with PoFA. As there is no keeper liability, therefore, liability cannot flow from the driver to the keeper and so, is an automatic win at POPLA. Please cancel the notice or issue a POPLA code at which point you will auto withdraw.