Earlier quoted context omitted.
The NHS consumes about half of all day to day public service spending. It is singular in its ability to suck spending out of UK government.
That seems like a lot. Can I ask where you got that figure? Is "day-to-day" denoting some kind of specific budget? I just tried to Google it and their AI responded with "The NHS and social care account for roughly half (49%) of all day-to-day public service spending controlled by the Westminster government.", linking me to a report from the The King's Fund [1]. But on reading that report, it seems to say only that 49…
Day-to-day is the routine, required cost of running the state, without long term infrastructure spending.