I quoted Bellinger v Bellinger because the newly published EHRC Code of Practice refers to the factors listed in the section of Bellinger that I quoted. It's paragraph 2.88 of the Code of Practice. I'll quote it again.
2.88 The Supreme Court in For Women Scotland ruled that ‘sex’, ‘woman’ and ‘man’ in the Act mean biological sex, biological woman and biological man. The judgment uses the expression ‘biological sex’ to describe the sex of a person at birth. Earlier case law [footnote 12] has set out the indicators of biological sex.
Equality Act 2010: Draft Code of Practice for services, public functions and associations, 2026 - GOV.UK
Footnote 12 - Read, for example, Bellinger v Bellinger [2003] UKHL 21 at paragraph 5
The newly released Code also says
2.49 The Supreme Court in For Women Scotland Ltd v The Scottish Ministers (For Women Scotland) [2025] UKSC 16 has ruled that a GRC does not change a person’s legal sex for the purposes of the Equality Act 2010. The judgment held that ‘sex’, ‘woman’ and ‘man’ mean, respectively, biological sex, biological woman and biological man for the purposes of the Equality Act. The judgment uses the expression ‘biological sex’ to describe the sex of a person at birth. The phrase ‘biological sex’ has the same meaning when used throughout this Code.
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I'm not using it for the holding in the case but for the definition of sex since that was the definition used by the EHRC in the guidance issued on 21 May 2026.
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The Supreme Court ruled that 'sex' and 'women' under the Equality Act mean biological sex at birth.
A person who is a biological man, ie who was at birth of the male sex, but who has the protected characteristic of gender reassignment is described as a “trans woman”. Similarly, a person who is a biological woman, ie who was at birth of the female sex, but who has the protected characteristic of gender reassignment is described as a “trans man”. We describe trans women and trans men who have obtained a gender recognition certificate (“GRC”) under the GRA 2004 as “trans women with a GRC” and “trans men with a GRC” respectively and their gender resulting from the GRC as their “acquired gender” or “acquired sex”.
We also use the expression “biological sex” which is used widely, including in the judgments of the Court of Session, to describe the sex of a person at birth, and we use the expression “certificated sex” to describe the sex attained by the acquisition of a GRC.
. . . .
The interpretation of the EA 2010 (ie the biological sex reading), which we conclude is the only correct one, does not cause disadvantage to trans people, with or without a GRC. In the light of case law interpreting the relevant provisions, they would be able to invoke the provisions on direct discrimination and harassment, and indirect discrimination. A certificated sex reading is not required to give them those protections (paras 248-263). (xviii) We therefore conclude that the provisions of the EA 2010 which we have discussed are provisions to which section 9(3) of the GRA 2004 applies. The meaning of the terms “sex”, “man” and “woman” in the EA 2010 is biological and not certificated sex. Any other interpretation would render the EA 2010 incoherent and impracticable to operate (para 264).
For Women Scotland Ltd (Appellant) v The Scottish Ministers (Respondent)
How can events that happened later in life be ‘present at birth’? Only things that were present at your birth could possibly be relevant to determining your sex at birth, which is what biological sex means in the Equality Act.
You're XY.
You say
Gonads, do not exist
Internal structures, do not exist
If you didn't have gonads or internal structures at birth, it sounds like you're a man. There was nothing present at your birth to indicate you were female.
Therefore, under the Equality Act, you are legally a man and have been a male since birth. Unless the law is changed, you'll always be a man. None of your arguments or certificates matter because they don't change your biological sex at birth.
I don't see any good faith argument that you're a woman in the UK.
You're probably legally a woman in Canada. If being a woman is important to you, why don't you move there? I'm genuinely puzzled.