"Safe spaces for biological women only" is pretty unequivocal.
Please provide the evidence of this statement. It is one that you have stated and said is supported.
And you even posted a link that didn't use that kind of precise language at all to support it.
So, either you have nothing and have tried to convince us otherwise, or you really are just here to show your tribal attitude about this discussion and that you are not actually interested in the potential of how this may work.
I think it is good to know that you cannot support such a claim that actually would have convinced many of us here on this thread.
As far as the GP sign off, that has been reported as a potential idea. It is a very poor one in my opinion and amounts to self ID. Because that is the reality. As mentioned, there already was a consultation about self id in 2020, yet, Labour are doing another one. Why? Why not take the submissions from the last one to guide their decisions?