The best estimate we have is that around 0.4% of people are nonbinary (EHRC), over 250,000 people in the UK, comparable to the number of Buddhists in the UK - yet we are not counted in the UK census. We are not protected by the Equality Act unless someone thinks we're trans, we are required to pretend to be men or women when getting married, companies are not required to provide toilets or changing rooms for us, when we're in prison we share it with people whose genders differ from our own.