Nik, I've been on a Conti regime for a long time but when my patches went out of production I tried utrogestan with an 50 oestrogen only patch. This precipitated a torrential bleed like I have never experienced in my life...even after three births (and one PPH) and I ended up in A&E because I panicked.
Thank goodness I had found a really excellent meno specialist who was about to fit a Mirena but sent me for a thorough scan first. She was reassuring that this was most likely triggered by the change in hormonal regime and she also said, interestingly, that in her experience (anecdotal obviously but she sees a lot of women like us) in spite of the utrogestan popularity , it doesn't hold the lining as well as other preparations and progestins. My scan showed that any lining which might have built up over the years on my previous regime, had shed and all was normal. The radiologist also told me that the vast majority of bleeds of this nature are due to a hormone change. I was lucky to have been able to be seen privately but if you're in the London area I am happy to recommend. I'm now on Femoston Conti , not bleeding and apart from some cramps early on, and slightly sore nipples I'm doing better. No return of hot flushes etc. My bleeding stopped within about six days of the first heavy bleed so don't lose heart. Personally I didn't feel at all well on utrogestan or I might have given things a bit longer to settle. Best of luck.