The motion, passed overwhelmingly at the party’s annual conference in Brighton, makes the Lib Dems the first of the big three parties in parliament to call for a new approach to implementing last year’s ruling that the legal definition of a woman is based on biological sex only. The Greens have previously done so.

That's good. Labour is notably late here.

The Supreme Court ruling is wrong anyway. That said, it just means the Equality Act needs an amendment to make it less unclear that women includes trans women, but apparently no one has done that yet.

It's quite telling when someone, including supposed activist organization Stonewall, insists you should follow the law. Activism is all about not bending to unjust laws and rulings. Being publically gay was illegal until fairly recently in Britain. Did they just say "oh well, guess we can't be gay"? No. Of course not.