bookbinder - my understanding is that barsel does not want to go inot a care home, but in any case even if the NHS pays for the nursing element, there is still the other £500+ per month she'd have to pay for the "hotel" element (board and lodging)
As far as i know from what barsel posts, she gets out and about so would be extremely unlikely to qualify anyway.
I know i'm younger than you barsel, but the new knee was better than my other knee (which also needed replacing) after a few weeks, and took over as the "good" knee. However, from what you are saying you don't actually want to have the op anyway (even if you did have 24 hr care), so my suggestions are unhelpful.