The NHS is properly funded, the money spent on it hasn't decreased for a long time, and is still going up year on year. Chucking money at it, DOESN'T! WORK! There's far too much wasteage.
And yet other rich European nations spend much more on health, both per capita and as a proportion of GDP.
Spending on health in real terms needs to rise just to keep still, because an ageing population has more, and more complex, health needs, and because cutting edge health technology is expensive.