Patches, or oestrogel? - I'm feeling oestrogel as I've been told it's easier to control amount required?
I would definitely recommend the gel. Firstly, as you say, you can adjust the dose to suit your needs and from my own experience, I think it works better than the patch.
Is the mirena coil safe as the progesterone part? Or should I consider having it removed and using a bio identical progesterone instead?
Now that you have had it fitted, I would stick with the Mirena for now. The Mirena coil is not the same as Utrogestan, it is a synthetic progestin. However, it considered safe and the progestin content is mainly concentrated in the womb and is thought to be safer than oral synthetic progestins. That said, some does get into your system but not enough to worry about unless you are intolerant to progestins.
When using HRT do you use the oestrogen all the time including the days you take progesterone?
Yes, you use it every day including the days you take separate progesterone.
How soon do you know if it's helping?
With the gel, very quickly, probably a couple of weeks.
On another note, I had mirena coil inserted yesterday, and the hysteroscopy and biopsy, both uncomfortable procedures, I'm still feeling a dull ache today, especially left side, is it usual for it to be uncomfortable fr a few days? When should I be concerned?
Give it some time to settle down, it's normal to feel like that after a procedure. I had loads of pain after I had the Mirena fitted in fact I almost passed out at the FPC, broke into a profuse sweat and was shaking badly. I still don't know how I drove home. The first time I had a coil fitted I was in such a state the doctor that fitted it had to drive me home!
I would stick to the Mirena for now and see how it goes. If you tolerate it well then keep it but if you have any side effects, you can always have it removed and change to Utrogestan.
Hope that helps.