NCT info that I have seen tells women that many c-sections are probably avoidable. The Royal College of Midwives, the World Health Organisation and the Royal College of Obs and Gynae are largely with them on this.
They also point out the link between induction/epidural and hospital births and higher rates of instrumental and operative delivery.
As far as I can see, knowing this doesn't stop many of their clients trotting along to the labour wards of hospitals with colossally high rates of c-sections and a poor mother/midwife ratio, 'just in case' they need an epidural. Or having an induction they probably don't need. And then they have every intervention going and blame the NCT for being natural birth nazis and making them feel like a failure.
I didn't do NCT classes but I'm blardly grateful for the campaigning and research they've done to make birth more humane for women in the UK. If fewer than half of women in some hospitals are getting through birth without the aid of surgery or instruments then thank god someone is stepping up to the plate and pointing out that it's fucking madness and it doesn't (usually) have to be like that.
"I laboured, and bore my babies myself, and 50 years ago, none of us would be alive."
Can't comment on your particular case, but the c/s rate in the 1950's in the UK was 2%. It certainly wasn't the case that one in four mothers or babies died in childbirth.
"I would strongly advise either medically trained professionals should be running your courses "
That would be a bit pointless, given that they are not giving medical advice.
"I left NCT classes believing that staying on my feet during labour would increase the speed of my dilation - I was informed by my midwife after 24 hrs of labouring with baby going nowhere that this had in fact caused my cervix to swell and prevented dilation. "
Well - it does generally speed dilation. Which is why the NICE guidelines on intrapartum care advise that all mothers should be supported to mobilise in labour. What usually causes a cervix to swell is unproductive pushing on an anterior lip. Not being upright per se.