Cricket: I certainly can discuss it, but I doubt I'll ever see them again. *sigh* Public system is a pain. No continuity at all.
I suggest that you have it written down on a piece of paper in your labour bag to hand to them to stick on your file/case notes while you are labouring, so that anyone during handover or doing anything for your care can see what you have consented to and what you haven't. And use that language: "I do not consent to abc unless xyz". And sign it. That's what I intend to do re antibiotics if I am group b strep positive - "I do not consent to the use of antibiotics during labour unless I am labouring prior to 37 weeks gestation, I am running a fever over 37.5, or my waters have been broken for longer than 12 hours." Whilst they might consider they can bully you into accepting alternative treatment, having a written statement refusing consent unless you expressly countermand it is pretty powerful.