They've been staunch for the best interests of women prisoners (as a prison reform charity, they're staunch on the best interests of all prisoners, but they have been exceptionally brave here on how single sex prisons should be retained as a human rights issue - and their director has stated that, as a man, he does not feel it is up to him to decide what a woman is...) and they published this response to GRA reform.
Liz Truss does not have ministerial responsibility for the prison system, but her comments are helpful in reaffirming that there is a legal basis for segregating prisons on the basis of sex, rather than by amorphous and subjective notions of gender identity.
This is not currently the approach of the prison service, which runs women's prisons as mixed-sex institutions. While the majority of males who identify as or believe themselves to be women are held in the male estate, a relatively small number are held in women's prisons. Placement in a women's prison is more-or-less automatic for male prisoners who have a gender recognition certificate indicating that their legal sex is female.
This is why moving towards a system that would have allowed individuals to change their legal sex by a mere declaration posed such a potential gatekeeping challenge to the women's prison system.
It was never 'just admin'.
The article goes on to say, If transgender males who identify as or believe themselves to be women cannot be said to have been "born in the wrong body", it is not unreasonable to ask why the Prison Service treats some transgender prisoners as if they are indeed women, trapped in a male body.
There was also an article a year or so ago which suggested that female prisoners, and not anyone else, should have the final word. Again, they are very women-centred in this area.