I'm a bit confused.
The consultant has said that it could be the HRT that is causing the bleeding and so said my choices are to stop it, have a combined HRT patch or a coil fitted
You said one option is to have a combined patch- so what are you using now?
You've said you're on continuous HRT now.
Why are you on continuous? It's for women post menopausal. It can be tried with women over 54 who are still having periods but the outcome is usually what you have- bleeding.
That's why you're bleeding so often. The small dose of daily progesterone won't control your own cycles.
You should try sequential that will give you a regular withdrawal bleed.
Also, if you are not post menopausal, that thickness of lining is not really high.
I'm often surprised at how quick some doctors are to do invasive tests without considering the whole picture.
Not post menopause, on HRT- but think there is an issue with 3-weekly bleeds (which are 99% likely to be your own natural cycle.)
Why didn't your GP just suggest sequential HRT?
If you're still having periods, your womb lining will not be below 4mm, even when using HRT. That doesn't mean you have hyperplasia or cancer.
The 4mm cut-off is for women post menopausal who have no bleeding for a year or more,the suddenly bleed, not women having regular 3-weekly bleeds who are not post menopause.