[Xaccers]

That's the sick situation immigrants are forced into, if they can't afford health treatment, and we're talking mostly in thousands of pounds not a few hundred, health care as you know is expensive, then you don't get it, even if it would put your life at risk, no matter how much tax and NI you've given.
"No recourse to public funds" on your visa means you're stuffed.
No JSA if you find yourself out of work, no hospital care even if you're dying (especially if you're dying as they're not likely to get you to pay for it!), yet you still have to contribute.

A friend of mine sold his house when he got divorced and used his share to buy his parents' house so that he could help look after his mum who suffers from bad alzheimer's.
When it was decided she was to be put into care, they investigated the sale of the property thoroughly to ensure that it wasn't just signed over to get out of paying for the care (several thousand a month).
Thankfully they saw that the sale was genuine and so he only has to make affordable contributions to her care, but if they had decided the sale was an attempt to get out of paying they would have sent him the bill and taken him to court if he didn't pay, which would have resulted in reposessing the house.