Sorry to reply to my own post but I thought this might be of interest:
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Stonewall Equality Ltd (originally The Stonewall Lobby Group Ltd) was incorporated in 1989.
This was largely in response to the passing of Section 28 the previous year (Section 28 Local Government Act 1988)
It is quite instructive to read what their original objects were (you may notice something that is missing that they have latterly heavily leaned in to):
3 The objects for which the Association is established are:
To protect and advance the civil, political, economic, social and cultural rights of lesbians and gay men to be held on an equal basis with other citizens
Just going totally off-topic, Ian McKellen the actor (now Sir Ian McKellen) was one of the original people who signed the form. He was originally going to be one of the directors but dropped out for some reason.
The other original directors were the actor Michael Cashman (now Baron Cashman). He is probably best known for being the first gay character on Eastenders back in the late 1980s (Colin Russell).
The other directors were:
Jennie Wilson. She is an Australian who was also a director of London Lesbian and Gay Centre Ltd.
Linda Deborah Ballard (I don't know anything about her)