Also in 2004 Labour covertly introduced a certain category of same sex marriage, despite explicitly saying they weren't doing so and also introducing civil partnerships in the same year precisely as a compromise to avoid doing so.
Alex Saying Stuff
It is very simple, in 2010 the Labour government passed a law that said that single sex services must be provided solely on the basis of sex assigned at birth, and did not provide any way for service providers to check sex at birth, and did this by also protecting the ability to change legal sex.