Why was a woman with this severity of mental illness considered able to consent to her 'transition'?
All the mental health professional bodies are captured by gender ideology. It's transphobia to question someone's gender no matter how out of touch with reality they are. If the planned 'conversion therapy' ban goes through, it'll be illegal for a mental health professional to question whether a mentally unwell person is really the opposite sex than they actually are.
What risk assessment was carried out as part of the drafting of the NHS policy that allowed her to be placed on a dangerous male ward?
None. Or if an EQIA was done, it will have had the section on sex changed to gender and the policy will have been assessed as being positive for people of gender. See the NHS audit threads for extremely ample proof.
What (if anything) should have happened to protect her from male assault?
Not putting a woman on a mens ward. If you put a woman in a mens psychiatric ward rape is very likely to happen.
What disciplinary action will managers and staff now face for not protecting her from rape by two other patients?
None. They were following policy. The policy is insane and was written by clueless activists bit whether they followed the policy is what matters. Plus all NHS data is corrupted by gender ideology so it's very possible she was recorded as male in the hospital system. Slim chance that a lowly HCA or band 5 might get hung out to dry for not supervising better, but not likely.
Are the managers and/or staff criminally liable?
The executives who signed off what will be a hospital-wide policy imposed with no consultation with front line staff fucking well should be, but they won't be.
How can we ensure this can never happen again in the UK?
If the government stopped their spineless fucking around and enforced the FWS decision it'd help.