On The Off Chance...

Today I have been mostly obsessing about the Gay Telephone Exchange, where in bygone days all sorts of mad drag queens and loons used to work. I believe it was in the Soho area (of course-) and it was the late-night Overseas department where all the raving went on.  Over the years I heard about it from several people, a couple of whom had very happily worked there. (Now alas, they're all dead, or moved away, and no longer in touch-)  I can't remember any details, but would love to know more. Still googling, but nothing concrete yet...Any ideas? It could make the scene of a great story.