I couldn't remember when I am supposed to get my MatB1 certificate - so I checked the government website - MatB1 Guidance
And apparently I am still expected to be "confined". Is this still really a thing?! Are we still calling it that?!
"Certificates must not be issued more than 20 weeks before the expected week of confinement. You should estimate as accurately as possible the date the woman is expected to be confined"
I know that some Asian cultures practice something similar but the UK generally does not expect or insist that women are confined after childbirth so I am surprised the language has not been updated.