t doesn't work like that.
Once he’s “lived as a woman” (whatever the fuck that means) for 2 years he can, under current law, apply for a Gender Recognition Certificate. Then he would by law have to be housed in a female facility.
If that legislation changes in the way that is currently being suggested, he doesn’t have to wait two years, he just has to say he’s a woman and off he pops.
Not a stupid man, Ian.
The only caveat is if the prisoner is too dangerous to be housed in a female prison as they do not have the same capacity to deal with high risk, aggressive prisoners as some male facilities. But I’m sure Ian will have been terribly well behaved.