They should force the SC pronounce itself as to what tf means that for them. I’d bet they are unable to give a definition of “biological woman” that doesn’t leave out a lot of what they think “true women” are. Carriers of two X chromosomes? Outliers. Carriers of no Y chromosomes? Outliers. Possessors of a uterus? Outliers. Producers of the big gamete (Rowling’s favourite) unless-unable-to-due-to-a-condition-that-is-morally-acceptable? Outliers everywhere. Then those outliers should sue.

Also curious why they aren’t worried about defining men. They should be forced to unless they want to tacitly be defining men as non-women. Which would be funny, but probably undesirable for them.