See figure 1.3a - https://www.gov.uk/government/publications/migration-advisor...
Note that to the best of my knowledge, these numbers don't include the Afghan resettlement scheme which would further lower the proportion of employment driven visas.
Who indeed will pick the cotton.
Aren't those nurses needed back home?
https://www.forbes.com/sites/katherinehignett/2023/06/07/uk-...