Call your UK insurer and ask them to send you a letter mentioning your NCB on it. Just submit the same, while filling the proposal form in India. I am also not sure, whether you would get it. But try.
Thanks Natraj - I have called my insurer and they are happy to issue me a letter mentioning the NCB on it. Would see in India, whether Indian insurer allow NCB or not. I will update you all, about the outcome.