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Prisoners who possess a Gender Recognition Certificate (GRC) are excluded from the detailed data on transgender prisoners. As of 31 March 2023, 13 individuals in prisoners in England and Wales had a GRC.
The latest HMPPS report indicates that on 31 March 2023, • There were 268 transgender prisoners in England and Wales, not including those with a GRC. • Of these, 225 prisoners reported their ‘legal gender’ as male and 43 as female. For the most part this is likely to be capturing sex at birth, given that prisoners with a GRC are excluded from the analysis. • 220 of these individuals were in male prisons and 48 in female prisons. • 80 out of 119 prisons had at least one prisoner who identified as transgender.
https://researchbriefings.files.parliament.uk/documents/SN04334/SN04334.pdf
Of the 13 prisoners with a GRC, the breakdown of those who are trans women and those who are trans men is not given.
Of the 13 prisoners with a GRC, the breakdown of their offences is unknown. Therefore the number of offences against women is unknown.
Of the 13 prisoners with a GRC, the breakdown of where they committed offences against women is unknown.
To make reasonable estimates of the number of trans women in prison, perhaps 8.
Of those 8 the number that had committed offences against women, perhaps 2.
Of those 2 who committed offences against women being trans women and in a women's space perhaps 0.
Trans women are also victims of sexual and violent crime perpetuated by men.
On balance it is more likely that trans women are the victims of crime against women than the perpetrators of crime against women.
And that's a more correct approach to considering data.