Why does the census say there are more trans people in Newham than Brighton?

Did you realise that one in every 67 Muslims is transgender? That adults with no educational qualifications are almost twice as likely to identify as transgender as university graduates? That the London boroughs of Brent and Newham are home to higher proportions of transgender people than Brighton and Oxford? These are some of the astonishing results from the 2021 census of England and Wales, which was the first in the world to ask about gender identity.