I've just been going through the EHRC statutory guidance on the equality act and have posted some stuff on the girlguides thread starting here.
Basically, the current position is that someone with a GRC 'must be treated according to their acquired gender' aside from a few very narrow exceptions. A trans person without a GRC should be treated 'according to the gender role in which they present'. They should normally be treated according to their acquired gender where they are 'visually and for all practical purposes indistinguishable' from a non-transsexual person of that gender. And again, if there are 'strong reasons' an exception can be used if it is a proportionate means to achieve a legitimate aim.
So if we take a hypothetical translady - let's call her 'Danielle' - who presents in a rather masculine way and cannot remotely be said to be visually and for all practical purposes indistinguishable from a woman:
Danielle with GRC = must be treated as female, aside from narrow exceptions.
Danielle without GRC = nah mate.
Obviously this is the theoretical way the law is supposed to currently work. It's not being applied like this because everybody has gone insane.
The proposed amendments to the GRA don't change the EA at all, they just change the process of getting a GRC. Whereas currently, Danielle might find it very hard to get a GRC, what with the whole living as a woman for 2 years + diagnosis of gender dysphoria requirements, under the new proposals Danielle can just download and sign a form. Once her GRC comes through, she then shares, for almost all purposes, the protected characteristic of sex with women and girls and can only be excluded in very narrow circumstances.
As others have said, there are also people campaigning to change the EA:
- to get rid of the sex based exceptions, at least where someone has a GRC
- to change the protected characteristic of 'gender reassignment' to 'gender identity'
There is a separate protected characteristic of 'pregnancy and maternity' which covers you from when you announce you are pregnant up to 6 months after the birth. If you are treated unfairly because you are BF an older baby, that comes under sex discrimination.