Soldato
A multicar policy is a policy where one policy holder has multiple cars.
Nope
If you check Admiral its clear its also family members etc.
Each car earns its own NCB
What could have happened to the OP is they matched his NCB (its one of the things they will do for second cars if they dont have their own NCB), which was probably an admin error and why he would appear to have lost his NCB
Even if they had made both the wifes, on transfer she should be able to keep the NCB for that car.