You stated you have been in the UK only on visitor's visas, and thus you wouldn't have used the NHS as a visitor, right? You probably don't want to say that you consider the UK as your 'country of residence' if you've only been a visitor. That sounds like you've been living in the UK when you have not been covered under a visa that allows you to do so.
You also stated 'NHS from what many people are saying isn't that great' - you never once said in your experience, you've been unsatisfied with the NHS.
And finally, I never said I didn't agree with your research. It just doesn't appear that you've done much based on your posts and questions.