Annie I do agree to an extent, and obviously, as a system the prison service do need to crack down on false claims of people pretending to be transgender, either to be relocated, or also the other reasons such as extra protection, support, attention etc etc inside. Somehow, and I don't profess for one minute to be able to begin to do this, but somehow we need a way of determining the 'truth' of these claims, because not all transgender (male to female) will be a risk to women in a women's prison. Same as not all transgender people (male to female) will be a risk to any females in any other female designated spaces. There will always be predatory behaviour exhibited in prisons, indeed women are at risk from other women in a women's prison, and men from men etc.
Prison gives people time- literally. We are talking about a sub-population of potentially dangerous, manipulative, calculating people (some, not all) in a hugely underfunded and under resourced system, that is growing daily. To open a 'third space' prison is complicated, because a) you'd need at least 2 because of transgender males/females being at risk from each other , b) the training and support required for officers and civilian staff would be tremendous, and it could be argued would be better used elsewhere, and c) there would be repercussions regarding the rights of those prisoners regarding family visits, locality etc. Aside from the fact that d) there are prisons literally full to the rafters with 3 men cells and being run into the ground due to underfunding. Women's prisons tend to be, not always, but tend to be- newer, better equipped, less capacity, etc. There are lots of reasons why a prisoner would want to go there, and probably not all would be motivated by a desire to prey on females. I cannot see it being a viable option to open or recategorise 2 existing prisons which will largely stand empty.
This would only penalise the genuine transgender prisoners, of which there must be some. I think the key to it is to improve facilities and services in all prison environments so that there is no great motivation for transgender prisoners to move to a women's prison. The system needs a shake and a huge injection of funding, not just focussing of rehabilitation but on improving conditions. This is never high on Parliamentary agenda.
With regards to 'non binary' spaces in public places, perhaps going forward this will be facilitated- but there will still be the fact of needing multiple non-binary facilities to accommodate the different types of transgender people. I know very little about this, but surely transgender female and transgender male are 2 groups, not one?
Please understand that I am not minimising the risk to females in female spaces, nor the unfairness that surrounds this, because it is true that female only (true female only) spaces are becoming diluted by this issue. I just don't what the solution would be, but from having worked inside HMP I can offer a small insight into the logistics which might be of interest.