Midwives' whole ethos is to promote normal birth. Epidurals do disrupt the normal physiology of birth and necessitate syntocinon augmentation, and often catheterisation, continuous monitoring, higher rates of episiotomy. Mothers who have one have a radically different postnatal hormonal profile in the hours after birth from women who've had an unmedicated labour. I appreciate that most people don't think that's important, but midwives study the minutae of birth - the finer points of mother and baby interaction in the hours after labour and how these are subtly influenced by hormonal physiology, hence many of them seeing epidurals as a complex intervention.
"Epidurals may slightly increase instrumental deliveries (by about 1 in 20) but they also reduce the risk of tears caused by uncontrollable pushing.@
As for the view that epidurals are not linked with higher rates of c/s, instrumental births etc (except slightly, for first time mothers), which is the advice given in the NICE guidelines, this is based on a meta-analysis of studies almost all of which compare women who are giving birth with epidurals with women who have been sedated with pethidine or other opioids. There are only a TINY number of studies that compare women labouring with epidurals with women having unmedicated labours.
In other words you are comparing outcomes for women having epidurals, with women who are having supine labours, who have been given a drug which is KNOWN to be associated with non-reassuring fetal heart rate traces in labour, and with a group where the majority of women will be having their labours monitored with CTG, something also associated with higher rates of emergency c/s in low risk mothers.
I personally think the evidence from the Place of Birth study is very interesting - that it shows low risk, healthy mums who opt to labour in a setting where epidurals are generally the most accessible (consultant led units) have double the rates of emergency c/s than women who have opted to labour in settings (home or midwife led unit) where an epidural requires transfer and is therefore less accessible.
FWIW I haven't seen the episode of OBEM from the other night. Will watch it this weekend. IMO the conditions women are subjected to in in big, busy consultant led units like the one in the programme generally necessitate epidurals except in the situation where the mothers labour is completely straightforward and quick. Labour is hard enough for most people without syntocinon/being expected to lie on your back/continuous monitoring.