No you can’t use it, I’m afraid. Each ‘new’ vehicle that an individual buys will start with NIL NCD. Likely you could find an insurer to mirror the NCD if driving is restricted to insured only or insured & spouse
As several people have already said (and done), you can use NCD built up on Motability cars on private insurance. Where on earth do you get the idea that you get NIL NCD with every new car. That is nonsense.