Lawfully bind a % of GDP, or equivalent unit of measurement, as a minimum government healthcare spend with a commitment to uphold the founding principles of the NHS. Financial means does not provide advantage, as all people are treated the same, and it is free at the point of care.
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The NHS is this country's greatest achievement. It is the back bone of the workforce. As our guardian angel, it is arguably our greatest social equaliser. Every election it becomes a football, every few years budget changes affect its running. Fix a minimum level of spending each year. Let the only political wrangling be about improvements or additional funding. Protect the NHS for all future generations from cradle to the grave, for the rich and the poor, and for the healthy and the vulnerable.