@MLClark "Call the Midwife" is currently in Season 13 (1969, I believe). They're already contracted through Season 15.
If you want a hint of where future seasons may go, here's a page on the history of U.K. midwifery. Regulatory changes are coming, if they stick to the history, which so far they have.
https://memoriesofnursing.uk/articles/midwifery-in-britain-in-the-twentieth-century
@MLClark This is another good article ...
"In 1974, however, midwifery care changed for good. Local authorities no longer employed district midwives or ran clinics or welfare centres. Their work was subsumed into the NHS and run by hospitals."
So I think they have five more years and then Nonnatus House is "sucked off," so to speak. 😉 👻
https://www.aims.org.uk/journal/item/history-district-midwifery