Right....here we go again.
The Registered Keeper, be it a company, or private individual, is the ONLY person who can insure the vehicle.
The Registered keeper is not necessarily the owner. For
example when the vehicle is owned by a finance company
Only the Primary driver on a policy can claim the NCD.
My wife and I are also retired. I have over 40 years ncd, and she
has over 25. As I always drive, except in emergency, we don't bother with my wifes ncd any more. She is a named driver on
my fully comp policy. To do what YOU want to do, however, you SHOULD change the ownership each year, so that YOU are the Registered Keeper this year, and SHE is the Registered Keeper next year, and so on. No money needs to change
hands, you are simply advising change of ownership.
That way, you keep it all legal.