Here is the update on scans and other things.
Firstly, thank you Hurdity for the links you gave in your reply, very useful to know, though haven't made use of them yet.
I finally went for a ultrasound vaginal scan some five weeks after seeing my doctor, not sure why it took so long, but when I googled the waiting time for getting a scan the NHS site did say it was two weeks for women over 55 or somewhat longer if under that age. So it looks like I was in the 'somewhat longer category.' Also I got a phone call direct from the hospital to arrange the scan and they sent the letter of confirmation after that, so I could have missed an earlier phone call as I wasn't expecting one.
After stopping the HRT I did go on to have another bleed some two weeks after, and four weeks after the bleed I had had before, again very much a typical (for me) period rather than just spotting, which was preceded by very obvious PMT.
I had the scan 16 days after the first day of the bleed, so possibly mid cycle, and all was fine. The procedure, for anyone who hasn't had one, wasn't at all uncomfortable for me and much less so than having a smear test done. The lady who did it said immediately that there was no thickening of the lining of the uterus, though she did say I had a small fibroid, but that it shouldn't cause any problems now I was going through menopause, and that she didn't see any reason why the HRT would cause a problem because the dose is relatively low. My ovaries were also still there and looked fine. So all good news on the scan front, other than having a fibroid that I never knew about. She didn't give me an exact measurement for either the lining or the fibroid, and I forgot to ask.
I was feeling fine for first two and half weeks post bleed, but then followed a crash in mood with feelings of anxiety, dark thoughts, low self-esteem and emotional fragility, and I'm waiting to see if I have another monthly bleed. Have an appointment booked with my doctor on the 8th of December and hoping, in light of the scan results, that she will agree to me continuing on HRT, possibly on a sequential one rather than the continuous. If she still is unhappy about it I thought I would ask to be referred to a menopause clinic, does anyone know how that works?
Hopefully I will find an HRT that works for me as I would rather avoid the worst of these symptoms as I know how quickly they can wear you down.