MrsStacey, if your GP is giving you the chance to consult Dr. Annie Evans at the Bristol Nuffield then I would grab the opportunity with both hands, she has an excellent reputation and is very knowledgeable on all things hormonal/menopause.
My local GP practice often sends patients to the local Nuffield hospital and they pay the full cost - my mother had her hip operation there on the NHS.
Speaking from personal experience, I had a Mirena coil in the lead up to the menopause and it started causing problems when my oestrogel levels dropped. Too much progesterone (in the coil) coupled with very low oestrogen levels is not good news but it is very easy fixed. I tried using oestrogen patches with the coil but didn't get enough oestrogen out of them so I would strongly recommend Oestrogel, I think it would work much better and it is very dose flexible making it easy to adjust the dose up or down as required. I wish I had tried that combination myself but unfortunately by the time I was introduced to Oestrogel, my coil had been removed.
I hope that gives you something to think about and run past Dr. Evans.
Good luck with your appointment!