He is stuck on whether a person can just say they identify as a particular gender or if they have to fill in a form
Because there are two things in play.
Equality act and the gender recognition act.
Under the equality act, you can just say it out loud. Because it's about being on 'any part of the journey'. And bingo, you cannot be discriminated against. So it assumes that you have a protected characteristic of gender reassignment, purely by saying so. In fact you don't even have to have that protected characteristic. If you are discriminated against on the basis that someone assumes you have, it's a breach. It's very woolly as to how this can play out, in terms of female spaces. Because the trans lobby claim that this protected characteristic trumps all others. And many businesses are going with it.
It doesn't. They all have equal weight. But there is absolutely no paperwork involved, at all.
The problem is, it's fairly discretionary and about personal policy. It's all about interpretation. There are no hard and fast laws. If your husband likes rules, he's shit out of luck with this one.
But that's different to being legally female. For which you need a gender recognition certificate. At the moment there are three criteria (age, living as your preferred gender for two years, and a diagnosis of gender dysphoria).
The government want to eliminate all the criteria, so it just becomes literally a form filling exercise. Name, address, cheque, your certificate will be in the post, thank you and good night.
I posted the Irish form on here awhile ago, and it was just that.
Legally female means you can get sent straight to a female prison, and go on an all women shortlist. You have to be treated as a woman unless the circumstances are exceptional. But, those circumstances do exist.
You have to have a form, though because you have to pay for the certificate and give them your address so they can send it to you.