To be honest, even if this bill doesn't go through, I don't think it matters a damn - that horse has already bolted. The current legislation (Gender Recognition Act) says a man can already legally change sex and still keep his penis, and the current Equality Act says a man with a penis is protected even if he is only 'proposing' to change sex.
As previously said above in this thread what matters is protecting female spaces. At the moment a service provider has to be able to prove the exclusion of men is a proportionate means of achieving a legitimate aim. What we need is case law. The only test case is this one where Susan, who had lived as a woman for 20 years and has undergone gender reassignment surgery, won the right to use the female toilets in a pub.
It is worth noting that this case was referred to in Maria Miller's original report on transgender equality here, point 122 and it is clear this case was based on the protected characteristic of gender reassignment under the Equality Act - the person in question did not have a GRC!
Perhaps on the back of this case the government issued this guide for providing services for transgender customers, which states, "“Good Practice 4: Assume everyone selects the facilities appropriate to their gender. A trans person should be free to select the facilities (such as toilets or changing rooms) appropriate to the gender in which they present.”
So we have already lost the bathroom and changing room argument.
Point 113 of Miller's original report says Women's Aid are already committed to ensure transgender service users are not discriminated against and point 127 says that while Women's Aid currently exclude trans people for employment posts within the organisation, "this policy is under review".
We are losing here! We need providers of female only services to stand strong for our rights under the Equality Act and fight any cases brought before the courts. How can we do this best?