Four writers left The Blair Partnership after claiming the company had refused to to publish a statement in support of transgender rights.
The author said she speak out about sex and gender issues partly because of her experience of domestic abuse and sexual assault.
Susie Green from Mermaids UK said JK Rowling's comments “invalidated” the existence of transgender people.
J.K Rowling’s boy wizard has been named the most inspirational children’s book character – beating fellow Hogwarts student Hermione Granger to the top spot.
#19YearsLater has been trending to mark the day when Harry Potter's son Albus goes off to Hogwarts
The US President gave an extraordinary press conference to defend his reaction to Charlottesville
The Harry Potter author incorrectly assumed the US President had ignored a disabled boy in a video in the White House
JK Rowling has hit back at one of her former fans who claimed she burnt the Harry Potter books
Six-time speed-reading world champion Anne Jones talks to Paul Ross, after polishing off the screenplay for JK Rowling's latest offering in double-quick time…