We cannot see the images because you have not included all the necessary BBCode. All we see is "[/img]"
However, according to the dates you have stated, the NtKs are not PoFA compliant. What that means is that, GN cannot transfer the liability for the PCN from the
unknown driver to the
known keeper. The
unknown driver is always liable but if they are unknown, there is nothing they can do. Catch 22 for GN.
It is too late to do anything about the first PCN and you will have to wait and see if they issue you with a POPLA code. If they don't, you complain to them and then to the BPA.
For the second PCN, you are probably still in time to appeal and you should send them the following:
This is an appeal by the registered keeper - No driver details will be given. Please do NOT try the usual Group Nexus 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.
As long as you do not reveal the identity of the driver, there cannot be any liability to you as the keeper.