It doesn't really seem like a fair comparison if 2022 alone (after the budget was already set) had more inflation than the preceding 6 years combined.
In fact, the NHS budget is rising substantially by 2023/24 to counter-act the recent inflation events -- to 160 billion. [1]
This would mean the NHS budget has risen by 60% between 2015 and 2023, outpacing inflation substantially to an increase in real terms.
Just to put this in perspective, the pro-Brexit campaign was mocked for "falsely" promising 350m pounds a week in additional spending, when the spending increase is already double that and is scheduled to quadruple by 2023.
[1] https://www.kingsfund.org.uk/blog/2022/11/autumn-budget-2022...
For example, due to an aging society with more and more healthcare receivers and proportionally fewer and fewer younger healthcare suppliers.
And how does it compare as a percentage of the national budget between then and now? Government spending as a whole went up in the past 2 years.
One of the pieces of fearmongering from anti-Brexit campaigners was that the NHS would be starved of resources and would not receive adequate funding.
Now that it's been proven a lie, anyone against Brexit claims they never made those statements.
In fact, one of the most lambasted pro-Brexit selling points was additional NHS funding. It actually happened.