www.supremecourt.uk/press-summary/uksc-2020-0081.html
"The central question is whether HMPO's policy breaches the UK's obligations under the Convention. There is no judgment of the European Court of Human Rights ("the European Court") which establishes an obligation to recognise a gender category other than male or female, and none which would require the Secretary of State to issue passports without any indication of gender. In fact, there does not appear to have been any case before the European Court concerned with the application of the Convention to individuals who identify as non–gendered."