Guessing not. But my mum says she thought I did. Insured on her car for the past year. Bout to get my own now. Would be nice if I did. They would get my custom anyway.
Most insurers offer this, usually its restricted to the insurer the policy is with, so only aviva would accept it . Although this can vary per insurer and some may offer an introductory bonus. Neither of these are the same as full NCB gained as a policyholder. HTH