As I understand it, the women's colleges at Cambridge accept TW. And I assume TM too (as that would make logical sense)... does anyone know for sure? I don't see how they can justify remaining women only without drawing a line somewhere. Otherwise they already have "male-presenting' students and actually male students.
They accept TW with a GRC (I believe they legally have to) and one or two of the three recently extended that to also allow for 'transitioning' students to apply. The change seemed intended to allow for people who would be intending to go down the GRC path but who because of their age (18) could not possibly have one yet.
I'm not sure they've had any actually apply, let alone be accepted. Cambridge colleges don't have to justify their offers, and can 'pool' any applicant they think would be up to the course but don't want themselves.
Re TM - I cant imagine why any would apply to a female college, and again, if any did so the college wouldn't have to accept them. Existing students who want to transition are supported in their choice if they want to move to a mixed college.
The college I know about has all single en-suite rooms in the first year, and very few shared rooms thereafter which are only ever allocated to people who want to share.
It also isn't a purely female enclave, 'single sex' only ever applied to undergrad admissions.
So while it's ideologically poor, in practice it's nothing for a female student or her parent to get alarmed about.