Do you want to try and get out of it as there is a way in Scotland, which cannot be done in England, since it is an offence to not sign the NIP?
Under Scottish law, there is precedence that you do not have to admit guilt unless under caution, signing the NIP is admitting guilt, but you are not under caution.
Therefore to ‘play the game of chance’, complete the NIP, BUT DO NOT SIGN IT. They will probably send another NIP to you pointing out you haven’t signed it, just do the same again, just keep not signing anything they send to you in the post.
From the initial NIP date, they have 6mths to prosecute you, so what they need to do is send police to your door with the NIP, they will caution you and then ask if the driver on the NIP is you.
I admit, it’s 6mths of looking out for every police car et al, as they could have your Reg number, but if you want to play, that’s how you do it 😉