As these people have been 'enlisted' by the women to overlook their births, should it really come to a surprise to anyone that they intervene perhaps a little too hastily in low-risk births?
Might be that these women WANT intervention sooner - or at least give the impression that they need it. The act of choosing a CLU so that you have this 'safety net' might mean you have lower tolerances and seek intervention sooner than others. It might be harder to decline this pressure, if you are working in a CLU as a result.
In answer to the Tooting / C&W difference, I think there's a lot of possible answers to that.
The ones I can are:
Does Tooting have the same specialisms as C&S? Even if they serve a similar population, it doesn't mean they would also have something like an FGM clinic; so women might be being referred to one rather than the other?
C&W has a private ward. Tooting does not. I think I'm right in saying that the figures for private wards are included in HES figures, which does distort them.
So again you are having women from outside the local area - who usually fit into a higher risk group - actively self selecting to a greater extent and further distorting the natural demographic of the area, making the figures less comparible.
Further still, when I've seen stuff about C&W I've heard it has a more pro-ELCS policy than perhaps Tooting has. If I lived equal distance from both and had a choice of the two hospitals, maybe this reputation would affect my decision based on my own personal opinion. Again, more self selection that fuels a difference in rates. If policies between hospitals were less variable and more consistent, maybe we would see less of this type of thing occurring.
I'm speculating here, but I think its worth doing. I don't think that even though Tooting and C&W initially look similar areas, that necessarily explains things fully. Thats what we need to fully explore; who exactly is being rejected and admitted into which hospitals (and why) rather than speculating on it too much.
I do think you raise some very important questions - that list you mentioned is now on NHS Choices too and would be high on my list of considerations (though its worth noting that patients in one area might naturally have higher expectations and standards than another, so patient scores can also be a little misleading too!). I do note the ratio of midwives to births is not on NHS Choices though. I think I know the reason why it isn't. Pure politics. Only Scotland and NI have a rate below the recommended 28 midwives to one birth according to this BBC article from 2011.
LaVolcan I've actually just looked at the data that you can download at the bottom of that BBC article too, which I find highly interesting. It gives details about the number of times a maternity unit has been closed and the number of women who have been diverted.
I think I'd like to see more made of this, as I've not seen this information anywhere else before. Knowing that Barnet and Chase Farm closed 140 times in 2010 alone would give me nightmares if it lived locally. I'd be re-mortgaging and going private faced with that as a possibility. No question. Its a simply scandalous figure. I haven't been able to find more up to date figures than 2010 though unfortunately.
Shag you are also dead right about stuff about episiotomy and birth positions. I think I've mentioned about similar concerns about those episiotomies figures before too.