"If you check Section 7 of the Equality Act 2010 it qualifies the protected characteristic of 'gender reassignment; as applying only to "transsexuals"; ie: those who have a GRC issued in accord with the GRA 2004."
That's not correct, Jacky.
If you are even 'proposing' to undergo a 'process' of changing sex, then have the 'protected characteristic of gender reassignment'.
Such a process could be something as simple as putting on a dress. It is not at all connected to a GRC.
As such, for example, an 18 stone 6'4" man with short hair & his arse hanging out of jeans going into the woman's toilet COULD have the protected characteristic of gender reassignment.
And how? He simply says 'I am proposing to change gender'.
So all white men (and they love doing this, IME) can claim 'protected characteristic', simply by claiming. And you cannot refute that there is no objective definition there.
For example, David Cameron COULD claim to be proposing to change to female, but he could NOT claim the protected characteristic of 'race' as a black man, nor the protected characteristic of 'pregnancy', 'disability', etc. Because these are objective realities.
Transgender is nothing objective. I say I am trans, therefore I am.
Anyway, the issue of the Equality Act is that it creates this 'protected characteristic', it puts eggshells on the floor that you have to beware of. Any time you challenge someone who looks wrong they can claim to be trans and you are in all kinds of shit.
What the Equality Act says is that:
"Gender reassignment
28(1)A person does not [commit] gender reassignment discrimination, only because of anything done in relation to a matter within sub-paragraph (2) if the conduct in question is a proportionate means of achieving a legitimate aim.
(2)The matters are—
(a)the provision of separate services for persons of each sex;
(b)the provision of separate services differently for persons of each sex;
(c)the provision of a service only to persons of one sex."
So in other words you do NOT commit gender reassignment discrimination IF you can show that it is both proportionate and legitimate.
Unfortunately "this will often require a case-by-case approach to determine what is legitimate and proportionate in any given circumstance." www.equalityhumanrights.com/en/our-work/news/our-statement-sex-and-gender-reassignment-legal-protections-and-language
Hence any time you say 'no transwomen', then you are opening yourself up to lawsuits & being publicly pilloried, etc.
It is not clear whether excluding transwomen from public toilets would be found to be legitimate or proportionate - I suspect not, but the bigger problem is that the vagueness of this is such that you have a de facto state of men (because 'transgender' doesn't mean anything) being able to go wherever they like.