It’s interesting to look back at the GRA too
This thread covers some objections which were sadly ignored as they turned out to be where we are
https://www.mumsnet.com/talk/womens_rights/5015686-5015686-gender-recognition-act-2004?reply=133844572
There are also fundamental issues of human rights in the Bill, affecting individuals who have not themselves undergone a change of gender but may have their rights compromised by a person who has changed gender. For example, it will be possible for an individual to change their gender without undergoing an operation for a sex change. That person will then be quite within his or her rights, as we understand it, to, for example, share a prison cell, nurses' quarters or sports changing facilities with others of their chosen gender. Even though there is treatment to modify sexual characteristics, should we not consider the feelings of those with whom that person shares very private areas? Whose human rights take precedence? How does one judge in individual circumstances what is balanced and proportionate?
On men cheating in women's sports:
When a six foot eight inch, 22 stone lady turns up to join the hockey club and denies that she has changed gender, who can attest to the contrary? Her birth certificate will have been altered and it will be a criminal offence for anyone to reveal that fact. Just how do we proceed in that matter? It is no good saying that we can leave it to people in the sporting associations. We cannot. That is impossible.
Someone did respond
Let me make it clear that it will not be possible for a man simply to declare that he is of the opposite gender and then compete in women's competitions
That person got it wrong