Found out bit more info...
"The sex of Butterbur florets is complex, some florets seemingly being composed of sterile bits of the opposite sex
The flowers of the male plant are larger (7-12mm) than those of the female plant (3-6mm), but the situation is reverse regarding the height of the plants; the females are taller. It is likely that it is only native where both sexes occur together"
Going to wait a bit and see which I've got here...or both! Apparently the female plant is taller but has less flowers, it's reversed for the male plants - shorter but more flowers. I'll let you know 😄