To obtain a Gender Recognition Certificate (GRC) in the UK, an individual must be at least 18 years old, have been diagnosed with gender dysphoria, and have lived in their acquired gender for at least two years. They must also intend to live in their acquired gender for the rest of their life. Evidence of living in the acquired gender for two years, such as name changes and gender markers on official documents, is required. Additionally, two medical reports, one from a medical practitioner on the approved list, are needed.
I would still not accept that such a person has the right to use single-sex spaces There are disabled loos available. The behaviour of Dr. 'Beth' Upton, who refused to leave the women's changing room when Sandra Peggie was dealing with a heavy menstrual flood, and his subsequent action in getting her suspended when she took issue with him, is evidence enough. What sort of person insists on intruding on someone in the middle of extremely personal hygiene, then initiates proceedings in the hope of getting her dismissed because she objects to his presence?