Sorry not change sex, change gender!
I think I am right in saying that currently in the EA:
Sex is a protected characteristic
also that
'transsexuals' are protected
Then the current legal fiction exists claiming that it is possible to change sex ie- you can get F instead of M on your birth cert and passport.
Changing 'sex' needs to be exposed as a fiction and reversed, otherwise legal 'sex-changers' will be entitled to all rights and protections of the opposite sex - which is unethical.
'Gender identity' also needs to be changed to 'gender non-conformity' as a protected characteristic - because
a) gender 'identity' is a bollocks meaningless term - that suggests people get to choose what they are, against all fact and evidence and
b) this is part of the hashing together -conflating 'gender' and 'sex'.
Saying 'conformity/non-conformity' suggests gender is rules/systems that can be conformed to or not - there is an actual observable basis in reality for that.
But 'identity' - what do they mean by that? People are discriminated against because of what they are not because of what they 'identify as'. If you openly and vociferously 'identify as' something you are clearly not, then you may face ridicule for being a bit of a twat, but that is different from being targeted for something that you actually are, for example, being gender non-conforming.