So it seems after all the fiasco, I do not have Gestational Diabetes. That at least has been ruled out, although it does leave a couple of questions hanging which means we can't yet totally forget about this. I had another blood test today to rule out the last possible cause of a larger baby. If that comes back clear, in the words of the Consultant, "We have nothing to worry about... it seems you are just good at growing babies!"
The amniotic fluid result is something they do want to keep an eye on, as larger amounts of fluid can result in early onset of labour. We have another scan in 2 weeks, and if that shows normal fluid levels, they are happy to sign me off as all in order. If not, they will monitor me monthly.
Either way, we are so unbelievably relieved, and grateful to God for the sense of peace he has given us throughout. We are not entirely "through the woods" yet, but more confident than ever that God is a faithful shelter in the storm.