I recently took my 10-week-old to meet the consultant who looked after us during (a difficult) pregnancy and mentioned to her that if I have any more I would love a home birth birth but knew it wouldn't be recommended as I have GBS.
She told me that a fellow consultant recently looked after a lady with GBS who had a home birth with the consultant's blessing. All they needed to do was make sure a local community midwife could site the venflon (not every midwife is qualified to do so). The midwife came round early in the labour with the venflon and came back later on to administer antibiotics.
I saw a few GBS threads here when I was pregnant and the assumption, including mine, was that if you have GBS you are strongly encouraged to deliver in a hospital. So if any of you have GBS and want a homebirth, it may be possible after all!