I would say NCS is a good opportunity to see how living away at uni is like (Particularly in the second week when you are staying at a uni resident with a weekly budget and have to cook for yourself) if you were unsure about how independent living might be like. And maybe even for gaining team work skills. But I wouldn't say you are missing a huge opportunity to put on your UCAS personal statement especially since there are so many other things you could probably write about like your work experience will be a great example.