It's a long read, and I've not got through it all yet. Some of it seems positive - the recognition that biological sex is different from gender, for instance.
But at first glance, There are concerns. It seems to clearly indicate that the prison estate is segregated by "legal gender" rather than biological sex, for instance.
www.justice.gov.uk/downloads/offenders/psipso/psi-2016/PSI-17-2016-PI-16-2016-AI-13-2016-The-Care-and-Management-of-Transgender-Offenders.docx