"Spudulika, anyone can have a homebirth in the UK if thats what they want",
So the fact that only 2% of women nationally have one is indicative that the rest are a) aware that homebirth is as safe for low risk mothers as hospital birth b) confident that it's a reasonable choice?
Because when I had my first nobody mentioned it to me as a possibility and I was of the view that it was a very radical, 'fringe' choice that only a certain 'type' of person would go for, and that person wasn't me.
What changed my mind about homebirths was meeting a midwife who was supportive and proactive about birth outside hospital. Also knowing other women who'd had their babies at home.
"OK its not ideal if you have to pay an independent midwife but the choice is there"
What, even for mothers on benefits? 
"but through maternal choice a majority of women still want a hospital birth with medical back up"
But that's because homebirth is still seen as a radical choice, and most women believe that hospital is safer. It's not a choice rooted in an objective understanding of the facts. Women are being influenced in their birth choices by prejudice, fear, and by tradition.
Oh, BTW, women who have their babies at home have 'medical back up'. In choosing a homebirth you're not signing off your right to an epidural, to a c/s or to help from medics, should you end up needing it.
"Ask a woman in Africa with a fistula or a PPH if she would like a homebirth the next time"
Oh come on - you're assuming hospital birth as the 'default mode'. What women in developing countries want is good quality, affordable care, and that may well be the sort of care that comes from a properly trained midwife in their community with back up obstetric services. You're assuming that what we should be striving for in these countries is what we have here - 98% of women giving birth in hospital and high rates of intervention. What a disaster that would be - because it would be unaffordable and would be throwing the baby out with the bathwater.