Out of all day to day government spending on services (health, schools, police, courts, etc), the NHS consumes about 40% of departmental expenditure limits [1]. Although it is pre-covid and the picture has worsened significantly since then, this BBC article is quite good too at examining the different figures [2].

[1] https://www.gov.uk/government/statistics/public-spending-sta... (Diagram in section 2.2) [2] https://www.bbc.co.uk/news/health-42572110

It was widely covered at the time of the Spending Review last year, based on government figures.

Day-to-day is the routine, required cost of running the state, without long term infrastructure spending.