I followed the link in the footnote in Julian's article to the case of Green v Secretary of State for Justice. It's worth reading. A male prisoner who murdered his wife seeks to become a woman. In the course of doing so the prisoner seeks access to items under the MoJ's policy on transgender prisoners:
"Transsexual people, particularly those who have not undergone surgery or extended hormone therapy, may use various items to assist with their presentation in their acquired gender. These can range from sophisticated prostheses to padded bras. Regardless of their level of sophistication, access to them can only be restricted in exceptional circumstances. (Incentives and Earned Privileges) is not a justifiable reason for restricting access."