Hi I am the registered keeper of the car and the details are correct.
If you look at the NIP the first line of the address (which is not blanked out) is "The Company Secretary"
So it looks to me as if a Ltd Company is the registered keeper.... rather than you as an individual.
I think that means the Company Secretary or a responsible person being a director of the Company (which might be you) has to reply on behalf of the Company, being the registered keeper, naming the driver on the occassion.
The driver will then get another personal NIP requiring them to to supply all their details.