OK, trying to keep things general - I didn't hear the PM programme, so must catch up with that. No idea what the focus of the interview was. However, as a general rule, I find it very odd indeed that the following sequence of events is no problem at all to anyone involved with administering the GRA. It's perhaps not surprising that nobody involved in drafting the GRA anticipated issues like this, but nothing has been done to refine the Act since. What I outline below is very clearly not what Parliament expected would happen, from what I've seen of the Hansard records from 2004.
An individual applies for a Gender Recognition Certificate. This is from the guidance issued with the form.
The Standard Application track for a Gender Recognition Certificate requires applicants to demonstrate that:
•They have, or have had, gender dysphoria
•They have lived fully for the last two years in their acquired gender and continue to do so;
•They intend to live permanently in their acquired gender until death.
Individual confirms they meet all the above criteria and provides supporting evidence, including two medical reports, one from an approved mental health practitioner. (Individual is not required to have had any specific medical treatment, and certainly not required to have had sexual reassignment surgery.)
Individual gets GRC.
Individual later goes to fertility clinic to get help to use the anatomy individual was born with to become a parent in the only way possible for the individual's sex.
Individual is then recorded on birth certificate as male or female parent - i.e. the role corresponding to their birth sex. However, in every other respect the individual is treated as being the opposite to their birth sex.
I would find this odd in a male individual who has signed a declaration that they hate being a male and identify as a woman. I find it incomprehensible in a female individual who wants to be identified as a man. There is nothing on earth more female than becoming pregnant and giving birth.