There is no legal right to question whether a trans-gender person is a man or a woman, an employment tribunal has ruled.

Maya Forstater, 45, lost her job as a tax expert at the Centre for Global Development in March this year after she was accused of publishing “offensive” tweets questioning government proposals to allow people to self-identify as the opposite sex.

Her legal dispute against her former employer was seen as a test case on whether a “gender critical” view – meaning a belief that there are only two biological sexes – is a protected philosophical belief under the 2010 Equality Act.

However, in the landmark judgment published yesterday, employment Judge Tayler decided Ms Forstater’s view “is incompatible with human dignity and fundamental rights of others”.

If Ms Forstater had won the case, it would have legally prevented employers from dismissing staff for expressing the “offensive” view that there are only two biological sexes.