A woman who lost her job after saying that people cannot change their biological sex has won an appeal against an employment tribunal.
Maya Forstater, 47, did not have her contract renewed after posting tweets on gender recognition.
She lost her original case at a tribunal in 2019, but a High Court judge ruled her "gender-critical" beliefs fell under the Equalities Act.
The appeal said the tribunal had erred in law and another should take place.
Ms Forstater, from St Albans in Hertfordshire, did not have her contract renewed at the think tank Center for Global Development (CGD) in March 2019, after posting a series of tweets questioning government plans - which were later scrapped - to let people declare their own gender.
She claimed she was discriminated against because of her beliefs, which include "that sex is immutable and not to be conflated with gender identity".
In the initial tribunal employment judge James Tayler said that her approach was "not worthy of respect in a democratic society".
He concluded that Ms Forstater was "absolutist" in her view and said she was not entitled to ignore the rights of a transgender person and the "enormous pain that can be caused by misgendering".>continued