Very briefly, and in layman's terms, Stonewall changed their remit a few years ago, by including T in LGB.
The feeling is that they had achieved almost everything in terms of equal rights based on sexual orientation, and so looked towards transgender ideology as the next thing.
Unfortunately, it directly conflicts with their original remit.
They maintain that one's sex is determined by an inner gender identity. The feeling that you are male or female, rather than the fact of biology. And therefore homosexuality is based on feelings, rather than facts. Hence two males, if they say they are females, can be called lesbians.
Which leads to heterosexual males, pressuring lesbians for relationships and sex, on the basis that those heterosexual males are really homosexual females.
There has been a lot of persecution of gay men and lesbian women as a result. Including being told that their sexual orientation is a 'genital fetish'.
At the same time, many people, who were in the past, perhaps a bit ashamed about not supporting LGB people, enthusiastically embraced the addition of the T, in the mistaken belief that it was all part and parcel of the same thing.
Stonewall runs a scheme where they offer to formulate your LGBT policy for a fee. And you get awarded a place in their championship scheme, on the basis of how well you implement their policy. It's a yearly service, with a yearly fee.
What has happened is that they have misrepresented the law in terms of the civil rights of trans gender people under the protected characteristic of gender reassignment, to the detriment of women.
There are plenty of exceptions under the law which says women can have their own spaces and services. But Stonewall seem to keep this information to them self when training others.
It culminated in two women being no platformed by the university of Essex purely on the basis of their opinion about the trans ideology, even though one of them was going to speak about, I believe, Jewish persecution.
The University of Essex had an independent review of whether they had acted lawfully and it turned out they hadn't. That was the beginning of stonewalls exposure.
Since then it turns out that almost every government department, numerous universities, schools, The DVLA, the police etc, in fact 850 different organisations across the country, are signed up to stonewalls scheme.
Liz Truss (Minister for women and equalities, among other titles), has urged all government departments to withdraw membership on the basis of budgetary concerns. Other organisations are calling them dubious.
Stonewall are doubling down. Even going so far as to liken people who are critical of the transgender ideology to anti semites.
Oh, and they are being sued by Allison Bailey. A lesbian barrister who is accusing them of interfering in her chambers because of her views about the trans ideology.
The emails that have been made public are fairly damning.
If you advance search even the last month, with the word stonewall in the title, you will find all the info. Including exactly what people have to sign up for, when they enter the scheme. How much work is involved, and what they have to commit to. And it's not just about them. It extends to Their suppliers and tangential people connected to their organisation.
The real concern is how they have managed to acquire such a grip on so many organisations.