Ms Bailey said: “This is a vindication for all those who, like me, oppose the erasure of biological sex, women and same-sex attraction as material realities. It represents recognition judicial of the abuses that are done to us”.
JK Rowling tweeted: “Allison Bailey is a hero to me and countless other feminists for refusing to abandon her beliefs and principles in the face of bullying and discrimination. Congratulations.”
Ms Bailey, who is lesbian, helped set up the LGB Alliance in 2019 as a rival to Stonewall.
Kate Barker, managing director of the group, said: “Allison’s bravery and steadfast focus on truth and justice have profound implications for women and LGB people who will not be intimidated by the pernicious poison of the ideology of extreme genre. We are eternally grateful.”
Alongside her action against Garden Court, Ms Bailey also sued Stonewall, claiming the charity had induced the chambers to discriminate against her. However, this was rejected by the court.
The court also rejected Ms Bailey’s separate claims of indirect discrimination by Garden Court and that the chambers allowed Stonewall to run its complaints process. The court did not accept that he had lost work and income because of his original protest.
In December 2018, Stephen Lue, a family law lawyer, emailed colleagues informing them that Garden Court Chambers was becoming a Stonewall Diversity Champion, a scheme under which businesses pay the charity to continue providing advice on inclusion at work.
In response, Ms Bailey emailed: “There are many of us within the LGBT community who fully support trans rights, but do not support the trans extremism currently advocated by Stonewall and others. I’ I strongly oppose any formal association with Stonewall.”
He later accused the charity of operating as a “criminal protection racket” by inducing companies and institutions to adopt its policies. He had to raise more than £500,000 to fight his case.
A spokesperson for Stonewall said: “We are pleased that the employment tribunal has ruled in a decision that Stonewall was NOT found to have instructed, caused or induced Garden Court cameras to discriminate against Allison Bailey.”
A spokesman for Garden Court Chambers said: “We are reviewing today’s judgment, which dismissed Ms Bailey’s claim against Stonewall and most of her claims against Garden Court Chambers, including all of her indirect discrimination claims.
“We have maintained throughout that our members, quite reasonably, have differing views on the complex debate about trans and gender-based rights. Our primary focus has always been to uphold our values and maintain an inclusive workplace and welcoming for everyone.
“We are carefully reviewing the sentence with our legal team for possible appeal.”