Thanks so much to all of you for your replies and good advice. They've helped to reassure me that I'm not being unrealistic, or ridiculous for not wanting to be automatically put in a high-risk category just because I have GD, and when all indicators at this stage suggest things are going well. While everything looks fine I want to plan accordingly (and feel supported in that choice by my caregiver) rather than assume worst-case scenario and be filled with fear. I'm going to see my GP today (I trust her implicitly and she works as part of the public, shared antenatal care scheme) so it would be good to get her thoughts. I'm happy with the hospital I've chosen (good reputation, great midwives and really well equipped birthing suites) so I guess my first preference would be to change OBs if we can so that I can stick with this hospital, but if it all seems too hard or stressful then I'm not afraid to go to the public system. If I end up staying with this OB, my Calmbirth instructor suggested I go to my next appointment with a list of birth preferences to discuss with him, to show him DH and I are serious and have an informed opinion about the natural birth experience we want, and ask him whether he's willing to support that all things going normally. Hopefully we would then get either an undertaking from him that he's willing to support our plans or a definite vibe about his lack of support in which case we'll absolutely go elsewhere. Thanks again for your support.