Mermaids interpretation of the law pertaining to children in relation to the GRA 2004 and to the Equality Act 2010 is completely wrong!
As we all know, children cannot apply for or obtain a GRC so cannot change their "legal sex" on their documents. Case law is clear that unless a GRC is obtained, the correct comparator is the sex being "transitioned" from not the sex being "transitioned" to.
In UK law the terms "transgender", "gender", "gender identity" have zero legal meaning since none of these terms appear in any UK law. The only term that does appear in UK law, in the Equality Act 2010, is "gender reassignment", which relates back to the GRA 2004.Thus, UK law requires that all children [ie: those who have not attained the age of 18 years] be treated as the sex on their Birth Certificate. There is no legal requirement for anyone to treat a child as the sex they claim they are "transitioning" to. So for anyone to say that the law requires this is false.
IN UK law, even if an adult has obtained a GRC the requirement to treat that person as the sex they have "transitioned" to is confined to the limits of what is described in GRA 2004 [ie: marriage and claiming of benefits and state pension: see GRA 2004 section 9 subsection 3] plus the relevant parts referring to discrimination under gender reassignment of the Equality At 2010. In section 9 of GRA 2004 the phrase "for all purposes" is used and this phrase is qualified by subsection 3 which explains that this concept is confined to the limits of that Act:
9 General
(1) Where a full gender recognition certificate is issued to a person, the person’s gender becomes for all purposes the acquired gender (so that, if the acquired gender is the male gender, the person’s sex becomes that of a man and, if it is the female gender, the person’s sex becomes that of a woman).
(2) Subsection (1) does not affect things done, or events occurring, before the certificate is issued; but it does operate for the interpretation of enactments passed, and instruments and other documents made, before the certificate is issued (as well as those passed or made afterwards).
(3) Subsection (1) is subject to provision made by this Act or any other enactment or any subordinate legislation.
www.legislation.gov.uk/ukpga/2004/7/section/9