Slightly different situation OP, but I am no longer on hrt due to hyperplasia.
I am taking black cohosh now as an alternative (prescribed by gynae).
After stopping hrt I started to get some symptoms and although it's early days, I am feeling better on the supplement.
I am not in the UK and alternate options are used a lot here. Not everyone can or wants to be on hrt and this is okay.
One thing I have found is that advice and opinions depend on the forum/group/board you visit. Many are so pro hrt that no matter what you post, the replies will all be the same.
You need to do what you feel is right for you.
Some of the more natural options are lions mane, ashwaganda, black cohosh etc.
The down side to this option is that they will be an out the pocket expense as I assume nhs don't cover these. I have medical insurance where am I, so fortunately mine is part funded, whereas hrt patches/gels/pills are fully funded.