I don't know much about it tbh Beans. We've not covered anything that isn't "normal" at uni yet though of course I've come across plenty of things on placement that are not normal!
The homebirth website actually has a very good article on it with all the references to guidelines etc rather than just anecdotal. A snippet from it
"If the mother's vagina is colonized with Group B Strep, her baby's skin may pick it up from the birth canal during labour. But just having a positive skin test for GBS does not mean that your baby is unhealthy - it is normal in this situation and for the vast majority of babies, it will not cause any problems at all. However, in a small minority of babies the bacteria can go on to cause an infection, and these babies develop Group B Strep Disease, more technically termed Early Neonatal Group B Streptococcal Septicaemia (ENGBSS), where the GBS infection causes blood poisoning. This can lead to meningitis and disability or death.
GBS disease is very rare - in the UK, if the mother is known to carry GBS when she is in labour, there is a 35-50% chance that her baby will pick up GBS on its skin, but only 0.2-0.5% of these babies will become ill as a result. Putting these figures together, if a woman who is carrying GBS in labour has a 50% chance that her baby will pick up the bacteria, the chance of the baby developing GBS disease is between 1 in 400 and 1 in 1,000."
Full article is here. It goes through various options about the antibiotics eg asking to have them administered in a bolus dose or even via IM injection rather than having a drip so you can still have freedom of movement.
It is a funny one really. We don't routinely test for it in the UK because it isn't thought to be beneficial to do so yet if we do know a woman has it then she is considered high risk. I find that very odd, heck I've never been tested, I could have it for all anyone knows yet I'm considered a low risk perfectly good home birth candidate!
Hope it goes well for you and that the link is useful in understanding a bit more about it.