From your mention of the NHS, I'm assuming your British?
Most of the ladies in here are American and I can tell you that 100% birth is a completely different experience in England compared to the US, and then again for each and every lady.
I don't know much about the whole strep b positive deliverer's but I personally only had an I.V for my first because I was induced.
Throughout pregnancy you do have to have a lot of blood taken, blood tests and urine tests so unfortunately needles aren't avoidable. ]: But it's worth it to know you and baby are healthy, if I hadn't had the tests something really bad could of happened with my first and I'm glad of them.
In England it's very focused on Midwifes who handle pregnancy and delivery, not Dr's and nurses, it's much more acceptable to have a home birth, birthing centres and of course you can choose hospital, but I know it's not for everyone.
I had both mine in a hospital and the first I had a lot of aid which was needed. Second I was barely touched by anyone, I controlled everything, no needles, no I.V, nadda.
So really it will depend on your pregnancy, how your labour goes, no-one can say YES or NO to the things you fear unfortunately, but please do keep in mind that just because one person had something done doesn't mean you have to. Each country and each hospital/midwife works differently, and your body will be the big determining factor in what you do and don't need.