The renewal should somewhere contain a list of incidents that have been taken into account in assessing the premium. Is this one there? Maybe headed Insurance History.
Who paid the other driver - your insurance company or his?
If his company paid, and your claim fell within the excess, then you haven't had a claim and won't have lost your NCB regardless of whether it is protected or not.
If you don't have protected NCB and your insurance company did pay something out for you or on your behalf, and it's not mentioned in the renewal, then check with them. It could affect the validity of your insurance - probably not negate it entirely but they could be iffy about paying for damage to your own car