As these are over a year old there's not much you can do now. You could try naming your granddaughter, but then she would be liable, and with an overseas address I imagine they will just ignore it. With the best part of £2k in play, I imagine they will eventually bring this to court. Often these are discontinued, but again as there are 10, they may be more interested in pursuing it all the way to a hearing. Arguably the NTKs are not POFA compliant for transfer of liability (no period of parking, no invite to pay / name the driver) and the 'no parking' prohibition is incapable of forming a contract.
Just got to wait it out for a Letter of Claim, and then the court claim. They have 6 years to bring the claim - should you move in this time, make sure to notify them, the last thing you want is a claim going to an address you are not longer at, and them getting a default judgement.
