The liklihood of a child in the UK being mis-sexed is extremely remote. Its third world country's that have less stringent follow up diagnosis.
For the benefit of all girls, it should be implemented widely. It will only take a couple of years, before TiB and TiM will no longer attempt to try play in girls and women's sports.
All sporting bodies will adopt sex based competition in their rules
A bloke is taking his case to the high court, he will set the precedent for all UK sports when he loses
I see it more as a stepping stone to normality in sports.
For elite level sports, it will be necessary for countries trying to cheat the system.