I got catastrophically ill when I was younger with a brain tumour which was compared to various citrus fruits.
The NHS has done and continue to do me proud with excellent care, specialist treatment, including experimental, money to help me get to London to visit the specialist, a variety of expensive cancer drugs for free (I'm diabetic so I don't pay prescription charges) a home help to check up on me when I was really bad, equipment to use at home so I didn't need to stay in hospital, regular routine follow ups, CAT scans, MRIs etc, counseling to help me deal with all of it (it was fairly traumatic), I also claimed benefits whilst I couldn't work to help pay bills.
I'm sure that my life has cost the NHS many thousands, maybe even £100,000s which I'm positive I will never earn enough to pay back in tax, and all the time it was happening, not a form, not a question, not a worry. Just everything taken care of. Even with insurance in the US I would not have got approved for experimental treatment and the co-pays on my drugs, MRIs (sometimes several in a week) , radiation therapy, hospital stays, the 4-5 times I had fits/seizures and was taken in an ambulance to hospital, would have been completely unaffordable (at 18 with very limited income).