I had a VBAC after two sections. First section was emergency after long labour, second was because I didn't go into labour naturally within 10 days of my due date and they couldn't manage to break my waters (wouldn't give me drugs to put me into labour due to risk of scar ruption)
For my VBAC I read up a lot. I really wanted a water birth but had been told it was impossible because they would want to monitor me constantly for potential scar rupture. Apparently the baby's heart rate raising is a good indication of that ( if I remember rightly - it was 11 years ago now!!)
I read that it is the hospital's responsibility to monitor me however I am labouring - if I'm standing up, moving around etc. Not just lying on the bed, which is easier for the hospital because they don't need to hold it. And I also found out they had a waterproof monitor that could be used in the pool. I researched and knew there was a consultant at the hospital who was very pro VBACs and asked to be put under her care. She was incredibly supportive, and we agreed the parameters of my VBAC. ie - if any risk was noted I would be sent for a section immediately.
As it turned out, I hated the pool as soon as I got in it!! I laboured for 3 days - I start off really slow - and then for 12 hours in the hospital very intensely. And they let me push for half an hour only - we did it though (with about 12 people in the room and a multitude of tools) They were all incredibly supportive.
With hindsight, would I do it again? It was the slowest of my recoveries and I was so focused on the VBAC side, I didn't concentrate on the how to manage labour better side.
Long post - sorry! In the UK, you can do it with the right support on your side. Read up, educate yourself so you can explain your choices. But also listen to the experts to make sure you are both safe.