A great deal of the transgender debate is unexplained. One of the most mystifying aspects is the speed and success of a small number of small organisations in achieving major influence over public bodies, politicians and officials. How has a certain idea taken hold in so many places so swiftly?

People and organisations that at the start of this decade had no clear policy on or even knowledge of trans issues are now enthusiastically embracing non-binary gender identities and transition, offering gender-neutral toilets and other changes required to accommodate trans people and their interests.