Thank you @Wid for posting this.
I've just had a chat with the HRT specialist at my GP practice.
They don't normally do bloods, for some odd reason (hmmm!), but because I was not doing well on patches or gel or anything after trying a lot of variants for years, I asked for bloods to be drawn.
And, wow, were my levels low...
Apparently, bone protection against osteoporosis from HRT occurs when the oestradiol level is over 200 pmol/L. Mine is 30 and I have osteopenia!
Also, my SHBG levels are very high. I goggled and found that "If your SHBG levels are too high, it likely means that less of your total testosterone is free testosterone that's available for your tissues to use. So, your tissues may not be getting enough testosterone." That makes sense to me, as I've been feeling very weak and fatigued recently (not to mention volatile!).
Anyway, as a result I am to start with Lenzetto spray when it comes through.