Whats slightly galling (this is my first NIP letter) is the coercion to make me say it was me.
Where is the coercion to say it was you?
As above, to say that you were the driver when you know you were not is attempting to pervert the course of justice. That inevitably ends in jail time, even for MPs:
https://www.theguardian.com/uk/2013/mar/11/chris-huhne-vicky-prycehttps://www.bbc.co.uk/news/uk-england-cambridgeshire-47040912I'm not sure they would succeed with the strategy of
"...we were unble to accept your previous driver nomination without these details." The law requires you to provide
"...such information as to the identity of the driver as he may be required to give by or on behalf of a chief officer of police." You've done that. You do not need to give proof that they were in the country or that they were insured to fulfil that obligation. However, they can ask you to provide proof of insurance cover and if you cannot provide it they can take action.
The police are naturally sceptical when they receive a nomination involving a foreign driver. By giving you the opportunity to consider whether you have made a mistake they are, in my view, giving you the chance to nominate who really was driving in the event you made a false nomination. It's their way of not getting too heavy when they suspect a false nomination was made. They do the same if (say) the driver was clearly male from their evidence and a female was nominated.
That is clearly not the situation you are in, but it seems you are very likely to be stuck with the no insurance allegation.