Welcome to the forum.

I look at things somewhat differently.
Ten years in the same place? So we can assume that you must be settled, then.
And assuming (again) that you must be happy in your work ... why are you too fussed about "climbing the ladder"? Could it be because you feel that others have left you behind? If so ... who cares? Let them get on with it.
In my opinion (based upon a lifetime of "work"), there's a lot to be said for being content with your lot in life; and if you can achieve that happy state of affairs (or in your case,
have achieved it, by the sound of it), why worry about what others may be doing?
On the other hand, after ten years perhaps it might be nice to have a change of scene. So why not think about moving on to "pastures green"? With your background, qualifications and experience, you shouldn't have too much trouble finding another position.
But about the BSc ... I would wait until you've moved on (if at all). Then (if you still feel a need to continue your studies) - go for an MSc. Otherwise (IMHO) you'll just be wasting your time. But as Robert has already suggested, you've already "got enough" in practical terms.
Lastly ... are you (still) truly happy with "biomed"? Perhaps now's the time to think about something else. Just look around at some of the old [censored] who populate our "trade", and ask yourself the question:- "do I want to end up like that"?

Bottom line:- are you happy where you are? If you really want promotion, you shall probably need to move (that is, apply elsewhere at a higher grade).
Good Luck.
