I just wanted to reassure anyone who has got a back to back baby. My first two were back to back and I have just had my third (1 week ago) who was not back to back. I can honestly say that I did not find the first two labours any more painful than this third one, in fact I found it strange to deal with contractions all round rather than just in my back. There wasn't a significant reduction in duration of labour with my third either.
Hope this helps someone as I have only ever heard scare stories about back to back labours and wanted to allay some fears.