If you are switching back to Femoston then finish the course would be best - and then you will be taking the full course of the combi tabs. Then you can start the Femoston on Day 1 at the beginning of the course.
However if you are in it for the long term - at your age you might want to seriously think about separate oestrogen and progestogen as I mentioned in my previous post below.
If you are talking to your GP - then great to show her the different preparations on this site from the links at the top. However showing her a forum post is not likely to endear you to her as we are not medical professionals - however knowledgeable we night be about menopause and HRT compared to some GPs! The posts are for your benefit based on our knowledge and experience.
Good luck anyway
Hurdity x