"girl guides and the wi have both made it clear they do f want to take this action, but have had their hand forced. I don’t really see how this benefits anyone."
Nope you're wrong there! GG and WI could both have undertaken the process to change their charter from female single sex group, to mixed sex. They chose to stay single sex and with that comes lawful discrimination against all males.
As to who it benefits, well it benefits the women and children who need single sex groups obviously.
If you think there's a demand for it you are welcome to set up a trans identifying men inclusive hobby group. There are alternatively, plenty of other men's single sex groups or actually mixed sex groups they could join if they wanted to. There are no laws stopping them from that, and the women in those mixed sex groups at least know they are going to a mixed sex group from the start.
The boys who are gender confused can join Boys Brigade, Scouts or other male single sex or mixed sex groups.