I can't answer all your questions or know whether my experience is typical, but I will share my experience.
Couples go, one girl comes with her sister because her partner works away, my husband went alone this week as I am poorly. We have 8 couples in our class, I think they go up to a max of 10 or 12.
In the first week we were asked if there were things we wanted to cover or not cover and we went from there. We do lots of things in small groups and have discussions and it is a workshop environment more than a lecture, so we ask questions and asked for input the whole time.
We don't know the syllabus as such as she changes it if we don't cover things or if some people can't be there. She puts a rough lesson plan up at the beginning of the session.
No-one takes notes, but that doesn't mean they can't. we got handouts and the teacher gave us a set too. She also puts out books we can borrow too.
She is going to cover interventions, pain relief and sections, and has no issue with any of that. My teacher is an ex-nurse and ex-midwife so she is quite clued up.
My teacher does breathing techniques and massage at the end of each class, but we don't do natal hypnotherapy specifically.
My NCT classes have no connection with the NHS or the hospital, so there is nothing like labour ward tours or info about what is or isn't available there. We were advised to contact our MW to ask how that is organised.