"The APPG at the heart of this story is the APPG on LGBT+ Global Rights. The narrow fact of the story is that the group’s chair broke parliamentary rules on transparency by producing a report that was kept secret from the public but used to assemble a network of parliamentary support for a concerted attempt to persuade ministers to do something deeply controversial. Another, apparently unrelated fact, is that trans-rights campaign groups paid the equivalent of £80,000 to the APPG."
https://www.spectator.co.uk/article/revealed-the-secret-trans-rights-lobbying-operation-in-parliament