Actually, the NHS doesn't have any per-patient treatment limit. They have a limit on which treatments are available on the NHS at all based on the cost-benefit ratio, which works out somewhere around £20,000 to £30,000 per quality-adjusted year of life. So people aren't forced to stop chemotherapy early, but they might be prescribed a chemotherapy drug that's slightly less effective than the very best but much cheaper. (We're generally talking very small claimed benefits, even in the studies done by the expensive drug's manufacturer to try and promote it - a lot of expensive new chemo drugs are just not that good.)